JB/T 6031-1992 General technical requirements for steel die forgings for engineering machinery
Some standard content:
Machinery Industry Standard of the People's Republic of China
JB/T6031—92
Engineering Machinery
General Technical Conditions for Steel Die Forgings
Published on 1992-05-28
Implementation by the Ministry of Machinery and Electronics Industry of the People's Republic of China on 1993-01-01www.bzxz.net
Machinery Industry Standard of the People's Republic of China
Engineering Machinery
General Technical Conditions for Steel Die Forgings
1 Subject Content and Scope of Application
JB/T6031—92
This standard specifies the technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of die forgings in engineering machinery products. This standard applies to carbon structural steel, high-quality carbon cable structural steel and alloy structural steel forgings manufactured by die forging, 2
Cited standards
GB1814
GB2828
GB3077
GB6394
GB12362
GB/T12363
JB/T5942
3 Technical requirements
3.1 Steel for forgings
Chemical analysis methods for steel and alloys
Macrostructure and defect acid etching test method for steel Metal tensile test method Metal room temperature impact toughness test Test method
Metal Brinell hardness test method
Priority number and priority number system
High-quality carbon cable structural steel
Technical conditions
Carbon structural steel
Steel fracture test method
Counting sampling procedure and sampling table for batch inspection (applicable to continuous batch inspection)Technical conditions for alloy structural steel
Method for determining average grain size of metal
Tolerance and machining allowance of steel die forgings Functional classification of forgings
General technical conditions for engineering machinery forgings Forgings should be forged from steel blanks forged from rolled products or steel ingots, and these steels must have factory certificates of conformity. 3.1.1
For steel keys, steel blanks and rolled products without certificates of conformity, they must be re-inspected according to relevant material standards and can only be used after being confirmed as qualified. The chemical composition and mechanical properties of steel for forgings shall comply with the provisions of GB699.CB700 and GB3077. When users have special requirements, they shall be determined by negotiation between the supply and demand parties.
3.2 Categories of forgings
Forgings are classified according to GB/T12363. The categories of forgings shall be indicated on product drawings and forging drawings. Those not indicated are Class IV. Marking method
Example:
Material grade approved by the Ministry of Machinery and Electronics Industry on 1992-05-28 - Material standard number
Forging category - GB/T12363
35CrMo-GB3077
II-GB/T12363
1993-01-01 implementation
3.3 Technical structure requirements for forgings
3.3.1 Classification of die forging slope and determination of its value 3.3.1.1 External die forging slope
JB/T603192
The part of the forging that tends to leave the die wall during cold shrinkage is represented by and (see figure) 3.3.1.2 Internal die forging slope
The part of the forging that tends to stick to the die wall during cold shrinkage. It is represented by B (see figure) 3.3.1.3 The die forging slope can be selected according to the following values: 0°15°, 0°30', 1°00°. 1°30'300', 5°00\, 7°00', 10°00°, 12°00'. 15°00\. R
The external die slope of the die forging hammer, hot die forging press and screw press is determined by the ratio of height to width H/B of each part of the forging in 3.3.1.4
and the ratio of length to width L/B. The values are shown in Table 1; the internal die forging slope β can be determined by increasing the value in Table 1 by 2° or 3° (except 15°)
When the die forging equipment has a material ejection mechanism, the external die forging slope can be reduced by 2° or 3° compared with the value in Table 1, but generally should not be less than 3° (except for local sensitive materials on friction presses)
Table 1 External die forging slope α
3.3.2 Classification and determination of fillet radius 3.3.2.1 External fillet half gun
The convex corner radius on the forging is represented by (see figure) 3.3.2.2 Internal fillet radius
The convex corner radius on the forging is represented by R (see figure). 3.3.2.3 The radius of forging corners shall be selected according to the following values: H/B
10°00°
12°00
10°00
15°00
12°00
(1.0).(1.5),2.0,2.5,3.0,4.0.5.0.6.0,8.0.10.0,12.0,16.0,20.0,25.0,30.0.40.0,50.0.60.0.80.0.100.0mme
Note: (1) The values in brackets should be used as little as possible. (2) When the fillet radius exceeds 100mm, select according to the R10 series of GB321, 2
3.3.2.4 Determination of fillet radius
JB/T6031-92
The value of fillet radius and R shall be determined according to the ratio of the step height and width of each part of the forging. The outer fillet radius shall be determined according to Table 2 and the inner fillet radius R shall be determined according to Table 3.
Table 2 Outer fillet radius r
Parting surface
Step quotient
>10~16
>10~16
3.4 Provisions for overburning of forgings
>16~25
>25~40
Inner fillet radius R
Parting surface
>40~63
Step height|| tt||>16~25
>25~40
Any type of forging is not allowed to be overburned. All overburned forgings must be scrapped. 3.5 Heat treatment of forgings
>40~63
>63~100
>63~100
Forgings should generally be heat treated after forging. The heat treatment specifications are generally agreed upon by the supply and demand parties and stated in the contract. The heat treatment methods are generally:
Quenching and tempering;
b. Tempering after normalizing;
Normalizing (annealing).
>100~160
>100160
The hardness values of forgings after heat treatment shall be in accordance with the provisions of Table 4 and Table 5. The hardness parts of forgings shall be marked on the forging drawings. 3
20CrMo
Pot material grade
20CrMnTi20MnVB
20CrMnMo 20CrNi3A
25MnTiBR
20CrMnMoB
15CrMo
35CrMo
4 0MnVB
45MnB 40CrMo
Carbon structural steel
Alloy structural steel
JB/T6031—92
Normalizing hardness range of common steel die forgings
120~156
130~170
156~207
170~241
156~207
170~241
149~197
170~241
156~207
170~229
179~255
170~241
156~217|| tt||170241
179~225
Table 5 Commonly used steel die forgings quenched and tempered hardness range Pot number Example
40Mn,40MnB.45Mn2
40Cr,35CrM0.45Cr
4.2~4.8(1.4~5.0)
4.0~4.6(4.2~4.8)
3.9~4.6(4.2~4.8)
Brinell hardness range dB
3.64.03.7~4.2
Note: Forgings are usually expressed in Brinell hardness. For ease of measurement, it is converted into the steel ball indentation diameter d value in actual production. 3.6 Surface defects
Surface defects of forgings refer to the sink, pitting, bruises, folds and cracks on the surface of forgings. The defects on the machined surface are stipulated as follows:
If the actual size of the forging is equal to the basic size, its depth tolerance is half of the single-sided machining allowance: If the actual size of the forging is larger or smaller than the basic size, its depth tolerance is half of the single-sided machining allowance plus or minus the single-sided actual deviation value. The opposite value is taken for the internal surface size. 3.6.2 If there are folds and cracks on the non-machined surface of the forging, they should be polished and removed. The removed surface must have a smooth transition. The polishing width should not be less than 4
JB/T6031-92
6 times the depth, and the length should exceed the defect length by more than 3mm at both ends. The grinding depth shall not be greater than the lower deviation of the size at that location. 3.6.3 The position of the indentation of the ejector rod shall be agreed upon by the supply and demand parties. Surface cleaning of forgings
The oxide scale on the surface of forgings should be cleaned. The cleaning methods include shot blasting, sand blasting, pickling, roller cleaning, etc. Dimensions and tolerances of forgings
3.8.1 The geometric shape and size of forgings shall comply with the provisions of the forging drawings. 3.8.2
The dimensional tolerances not indicated on the forging drawings shall comply with the provisions of GB12362. 3.9 Machining allowance
The machining allowance of forgings shall comply with the provisions of GB12362. 3.10 Residual amount on the parting surface
The residual amount of the flash located on the parting surface shall comply with the provisions of GB12362 after trimming. The flash located on the non-machined surface must be cleaned.
3.11 Misalignment
The misalignment amount of forgings shall comply with the provisions of GB12362. 3.12 Tolerance of shape and position
The straightness of the non-machined surface of the forging shall comply with the provisions of GB12362. The straightness and flatness of the machined surface shall comply with the provisions of GB12362.
3.13 Special requirements
When the purchaser proposes special requirements other than those in this standard, the supply and demand parties shall, after consultation, indicate such requirements in the relevant documents. 4 Test methods
The test methods for various inspections of forgings shall be carried out in accordance with the standards specified in Table 6 Table 6 Test methods
Inspection items
Chemical composition of steel
Macrostructure and defect acid etching test of steel
Metal tensile test
Metal room temperature impact toughness test
Metal Brinell hardness test
Steel fracture inspection
Metal average grain size determination
Test methods
GB1814
GB6394
4.2 The test location, sampling direction and quantity of various inspection items shall comply with the provisions of special technical documents or design drawings. The sampling method, location, direction and quantity of mechanical property inspection can be in accordance with the provisions of JB5942. 5 Inspection rules
5.1 The finished forgings shall be inspected and accepted by the inspection department of the manufacturing unit according to the forging drawings, relevant technical documents and this standard, and the ordering unit has the right to conduct re-inspection.
5.2 Inspection items of forgings
5.2.1 The inspection items and quantity of various forgings shall be in accordance with the provisions of Table 7. The sampling inspection plan shall be in accordance with the provisions of CB2828. The manufacturing unit shall specify it in the product technical standards or ordering technical requirements according to the product batch size and quality level. When it is necessary to add special inspection items and there are no corresponding national standards and industry standards, the relevant enterprise standards can be adopted and indicated in the professional technical cooperation. 5
JB/T6031-92
Table 7 Inspection Items H and Quantity of Various Forgings
Inspection Items
Sampled inspection per heat treatment heat, not less than 3 pieces
Full inspection or random inspection
Sampled inspection per heat treatment heat, but not less than 3 pieces
Sampled inspection per heat treatment heat, but not less than 3 pieces Less than 3 pieces
Full inspection or random inspection of quality parts:
Random inspection of heat-treated parts
Random inspection or no inspection
Mechanical properties
Macrostructure
Random inspection of one piece per batch
Random inspection of one piece per batch
Random inspection of one piece per batch
Note: Full inspection items are only applicable to small batch production. Random inspection is allowed when the material and process are stable. Random inspection
Random inspection of one piece per batch
5.2.2 Forging quality inspection usually includes geometric dimensions, surface defects and hardness. According to the requirements of the party, the mechanical properties of the forgings can be inspected. For particularly important forgings, non-destructive testing can be used to inspect the surface or internal quality of the forgings. 5.3 Inspection batches of forgings
There are two types of inspection batches of forgings: one is composed of plated parts with the same part number, the same smelting furnace number, the same heat treatment heat and the same production batch, and the other is composed of forgings with the same part number, the same steel grade and the same heat treatment specification. The first batch and single-piece forgings should be fully inspected according to the items in Table 7, and forgings with regular batch production and stable process should be sampled. 5.4 Re-inspection regulations
5.4.1 When it is confirmed that the unqualified results of the mechanical properties test are caused by improper heat treatment, the forgings and the samples can be re-heat treated and then sampled for testing. The number of repeated heat treatments shall not exceed two times, but the number of temperings is unlimited. The number of samples is the same as the first time. 5.4.2 If it is found that the overheated fracture and the macrostructure are in a coarse grain state, it is allowed to re-heat treat and re-batch and submit for acceptance. 6 Marking, packaging, transportation and storage
6.1 Marking and certificate
6.1.1 All forgings that have passed the inspection shall be marked. The content of the mark is generally part number, factory mark, smelting number, steel grade, work order number (combination number), heat treatment furnace number, etc.
6.1.2 Large and medium-sized parts shall be marked at prominent locations (or locations specified by the purchaser). Small batches of forgings can be labeled in batches. The labels can be made of aluminum plates or thin steel plates, or written with indelible paint. For forgings packed in boxes, the marks can be printed on labels that can be firmly attached to the packaging box or marked on the packaging box.
6.13 The delivered forgings shall be accompanied by a forging quality certificate. The contents include: manufacturer name or code;
part name and part number;
supply status;
steel grade and melting furnace number;
chemical composition, mechanical properties and other test results; number of forgings and single piece weight;
JB/T6031-92
9. Seal of the quality inspection department and signature and certification of the inspection personnel. 6.2 Packaging, transportation and storage
The anti-expansion treatment, packaging, transportation and storage of forgings shall be specified in the technical agreement or production contract. Additional remarks:
This standard was proposed and managed by the Tianjin Engineering Machinery Research Institute of the Ministry of Machinery and Electronics Industry. This standard was drafted by the Tianjin Engineering Machinery Research Institute of the Ministry of Machinery and Electronics Industry. The main drafter of this standard is Yang Chengshan.
People's Republic of China
Mechanical Industry Standard
Engineering Machinery
General Technical Conditions for Steel Die Forgings
JB/T 6031--92
Published and distributed by the Mechanical Standardization Research Institute of the Ministry of Machinery and Electronics Industry Printed by the Mechanical Standardization Research Institute of the Ministry of Machinery and Electronics Industry (PO Box 8144, Beijing 100081)
No reproduction is allowed
Copyright reserved
Format 880×1230
Sheet 3/4
First edition in October 1992
Word count 14.000
First printing in October 1992
Print run 00,001-500
Price 2.40 yuan
No. 096512 Form and position tolerance
The straightness of the non-machined surface of the forging shall comply with the provisions of GB12362. The straightness and flatness of the machined surface shall comply with the provisions of GB12362.
3.13 Special requirements
When the purchaser proposes special requirements other than those in this standard, the supply and demand parties shall, after consultation, indicate such requirements in the relevant documents. 4 Test methods
The test methods for various inspections of forgings shall be carried out in accordance with the standards specified in Table 6 Table 6 Test methods
Inspection items
Chemical composition of steel
Macrostructure and defect acid etching test of steel
Metal tensile test
Metal room temperature impact toughness test
Metal Brinell hardness test
Steel fracture inspection
Metal average grain size determination
Test methods
GB1814
GB6394
4.2 The test location, sampling direction and quantity of various inspection items shall comply with the provisions of special technical documents or design drawings. The sampling method, location, direction and quantity of mechanical property inspection can be in accordance with the provisions of JB5942. 5 Inspection rules
5.1 The finished forgings shall be inspected and accepted by the inspection department of the manufacturing unit according to the forging drawings, relevant technical documents and this standard, and the ordering unit has the right to conduct re-inspection.
5.2 Inspection items of forgings
5.2.1 The inspection items and quantity of various forgings shall be in accordance with the provisions of Table 7. The sampling inspection plan shall be in accordance with the provisions of CB2828. The manufacturing unit shall specify it in the product technical standards or ordering technical requirements according to the product batch size and quality level. When it is necessary to add special inspection items and there are no corresponding national standards and industry standards, the relevant enterprise standards can be adopted and indicated in the professional technical cooperation. 5
JB/T6031-92
Table 7 Inspection Items H and Quantity of Various Forgings
Inspection Items
Sampled inspection per heat treatment heat, not less than 3 pieces
Full inspection or random inspection
Sampled inspection per heat treatment heat, but not less than 3 pieces
Sampled inspection per heat treatment heat, but not less than 3 pieces Less than 3 pieces
Full inspection or random inspection of quality parts:
Random inspection of heat-treated parts
Random inspection or no inspection
Mechanical properties
Macrostructure
Random inspection of one piece per batch
Random inspection of one piece per batch
Random inspection of one piece per batch
Note: Full inspection items are only applicable to small batch production. Random inspection is allowed when the material and process are stable. Random inspection
Random inspection of one piece per batch
5.2.2 Forging quality inspection usually includes geometric dimensions, surface defects and hardness. According to the requirements of the party, the mechanical properties of the forgings can be inspected. For particularly important forgings, non-destructive testing can be used to inspect the surface or internal quality of the forgings. 5.3 Inspection batches of forgings
There are two types of inspection batches of forgings: one is composed of plated parts with the same part number, the same smelting furnace number, the same heat treatment heat and the same production batch, and the other is composed of forgings with the same part number, the same steel grade and the same heat treatment specification. The first batch and single-piece forgings should be fully inspected according to the items in Table 7, and forgings with regular batch production and stable process should be sampled. 5.4 Re-inspection regulations
5.4.1 When it is confirmed that the unqualified results of the mechanical properties test are caused by improper heat treatment, the forgings and the samples can be re-heat treated and then sampled for testing. The number of repeated heat treatments shall not exceed two times, but the number of tempering is unlimited. The number of samples is the same as the first time. 5.4.2 If it is found that the overheated fracture and the macrostructure are in a coarse grain state, it is allowed to re-heat treat and re-batch and submit for acceptance. 6 Marking, packaging, transportation and storage
6.1 Marking and certificate
6.1.1 All forgings that have passed the inspection shall be marked. The content of the mark is generally part number, factory mark, smelting number, steel grade, work order number (combination number), heat treatment furnace number, etc.
6.1.2 Large and medium-sized parts shall be marked at prominent locations (or locations specified by the purchaser). Small batches of forgings can be labeled in batches. The labels can be made of aluminum plates or thin steel plates, or written with indelible paint. For forgings packed in boxes, the mark can be printed on a label that can be firmly attached to the packaging box or marked on the packaging box.
6.13 The delivered forgings shall be accompanied by a forging quality certificate. The contents include: manufacturer name or code;
part name and part number;
supply status;
steel grade and melting furnace number;
chemical composition, mechanical properties and other test results; number of forgings and single piece weight;
JB/T6031-92
9. Seal of the quality inspection department and signature and certification of the inspection personnel. 6.2 Packaging, transportation and storage
The anti-expansion treatment, packaging, transportation and storage of forgings shall be stipulated in the technical agreement or production contract. Additional remarks:
This standard was proposed and managed by the Tianjin Engineering Machinery Research Institute of the Ministry of Machinery and Electronics Industry. This standard was drafted by the Tianjin Engineering Machinery Research Institute of the Ministry of Machinery and Electronics Industry. The main drafter of this standard is Yang Chengshan.
People's Republic of China
Mechanical Industry Standard
Engineering Machinery
General Technical Conditions for Steel Die Forgings
JB/T 6031--92
Published and distributed by the Mechanical Standardization Research Institute of the Ministry of Machinery and Electronics Industry Printed by the Mechanical Standardization Research Institute of the Ministry of Machinery and Electronics Industry (PO Box 8144, Beijing 100081)
No reproduction is allowed
Copyright reserved
Format 880×1230
Sheet 3/4
First edition in October 1992
Word count 14.000
First printing in October 1992
Print run 00,001-500
Price 2.40 yuan
No. 096512 Form and position tolerance
The straightness of the non-machined surface of the forging shall comply with the provisions of GB12362. The straightness and flatness of the machined surface shall comply with the provisions of GB12362.
3.13 Special requirements
When the purchaser proposes special requirements other than those in this standard, the supply and demand parties shall, after consultation, indicate such requirements in the relevant documents. 4 Test methods
The test methods for various inspections of forgings shall be carried out in accordance with the standards specified in Table 6 Table 6 Test methods
Inspection items
Chemical composition of steel
Macrostructure and defect acid etching test of steel
Metal tensile test
Metal room temperature impact toughness test
Metal Brinell hardness test
Steel fracture inspection
Metal average grain size determination
Test methods
GB1814
GB6394
4.2 The test location, sampling direction and quantity of various inspection items shall comply with the provisions of special technical documents or design drawings. The sampling method, location, direction and quantity of mechanical property inspection can be in accordance with the provisions of JB5942. 5 Inspection rules
5.1 The finished forgings shall be inspected and accepted by the inspection department of the manufacturing unit according to the forging drawings, relevant technical documents and this standard, and the ordering unit has the right to conduct re-inspection.
5.2 Inspection items of forgings
5.2.1 The inspection items and quantity of various forgings shall be in accordance with the provisions of Table 7. The sampling inspection plan shall be in accordance with the provisions of CB2828. The manufacturing unit shall specify it in the product technical standards or ordering technical requirements according to the product batch size and quality level. When it is necessary to add special inspection items and there are no corresponding national standards and industry standards, the relevant enterprise standards can be adopted and indicated in the professional technical cooperation. 5
JB/T6031-92
Table 7 Inspection Items H and Quantity of Various Forgings
Inspection Items
Sampled inspection per heat treatment heat, not less than 3 pieces
Full inspection or random inspection
Sampled inspection per heat treatment heat, but not less than 3 pieces
Sampled inspection per heat treatment heat, but not less than 3 pieces Less than 3 pieces
Full inspection or random inspection of quality parts:
Random inspection of heat-treated parts
Random inspection or no inspection
Mechanical properties
Macrostructure
Random inspection of one piece per batch
Random inspection of one piece per batch
Random inspection of one piece per batch
Note: Full inspection items are only applicable to small batch production. Random inspection is allowed when the material and process are stable. Random inspection
Random inspection of one piece per batch
5.2.2 Forging quality inspection usually includes geometric dimensions, surface defects and hardness. According to the requirements of the party, the mechanical properties of the forgings can be inspected. For particularly important forgings, non-destructive testing can be used to inspect the surface or internal quality of the forgings. 5.3 Inspection batches of forgings
There are two types of inspection batches of forgings: one is composed of plated parts with the same part number, the same smelting furnace number, the same heat treatment heat and the same production batch, and the other is composed of forgings with the same part number, the same steel grade and the same heat treatment specification. The first batch and single-piece forgings should be fully inspected according to the items in Table 7, and forgings with regular batch production and stable process should be sampled. 5.4 Re-inspection regulations
5.4.1 When it is confirmed that the unqualified results of the mechanical properties test are caused by improper heat treatment, the forgings and the samples can be re-heat treated and then sampled for testing. The number of repeated heat treatments shall not exceed two times, but the number of temperings is unlimited. The number of samples is the same as the first time. 5.4.2 If it is found that the overheated fracture and the macrostructure are in a coarse grain state, it is allowed to re-heat treat and re-batch and submit for acceptance. 6 Marking, packaging, transportation and storage
6.1 Marking and certificate
6.1.1 All forgings that have passed the inspection shall be marked. The content of the mark is generally part number, factory mark, smelting number, steel grade, work order number (combination number), heat treatment furnace number, etc.
6.1.2 Large and medium-sized parts shall be marked at prominent locations (or locations specified by the purchaser). Small batches of forgings can be labeled in batches. The labels can be made of aluminum plates or thin steel plates, or written with indelible paint. For forgings packed in boxes, the marks can be printed on labels that can be firmly attached to the packaging box or marked on the packaging box.
6.13 The delivered forgings shall be accompanied by a forging quality certificate. The contents include: manufacturer name or code;
part name and part number;
supply status;
steel grade and melting furnace number;
chemical composition, mechanical properties and other test results; number of forgings and single piece weight;
JB/T6031-92
9. Seal of the quality inspection department and signature and certification of the inspection personnel. 6.2 Packaging, transportation and storage
The anti-expansion treatment, packaging, transportation and storage of forgings shall be specified in the technical agreement or production contract. Additional remarks:
This standard was proposed and managed by the Tianjin Engineering Machinery Research Institute of the Ministry of Machinery and Electronics Industry. This standard was drafted by the Tianjin Engineering Machinery Research Institute of the Ministry of Machinery and Electronics Industry. The main drafter of this standard is Yang Chengshan.
People's Republic of China
Mechanical Industry Standard
Engineering Machinery
General Technical Conditions for Steel Die Forgings
JB/T 6031--92
Published and distributed by the Mechanical Standardization Research Institute of the Ministry of Machinery and Electronics Industry Printed by the Mechanical Standardization Research Institute of the Ministry of Machinery and Electronics Industry (PO Box 8144, Beijing 100081)
No reproduction is allowed
Copyright reserved
Format 880×1230
Sheet 3/4
First edition in October 1992
Word count 14.000
First printing in October 1992
Print run 00,001-500
Price 2.40 yuan
No. 09653 Inspection batches of forgings
There are two types of inspection batches of forgings: one is composed of plated parts with the same part number, the same smelting furnace number, the same heat treatment furnace and the same production batch, and the other is composed of forgings with the same part number, the same steel grade and the same heat treatment specification. The first batch and single-piece production forgings should be fully inspected according to the items in Table 7, and regular batch production and forgings with stable processes should be sampled. 5.4 Re-inspection regulations
5.4.1 When it is confirmed that the unqualified results of the mechanical properties test are caused by improper heat treatment, the forgings and the samples can be re-heat treated and then sampled for testing. The number of repeated heat treatments shall not exceed two times, but the number of tempering is unlimited. The number of samples is the same as the first time. 5.4.2 If it is found that the overheated fracture and the macrostructure are in a coarse grain state, it is allowed to re-heat treat and re-batch and submit for acceptance. 6 Marking, packaging, transportation and storage
6.1 Marking and certificate
6.1.1 All forgings that have passed the inspection shall be marked. The content of the mark is generally part number, factory mark, smelting number, steel grade, work order number (combination number), heat treatment furnace number, etc.
6.1.2 Large and medium-sized parts shall be marked at prominent locations (or locations specified by the purchaser). Small batches of forgings can be labeled in batches. The labels can be made of aluminum plates or thin steel plates, or written with indelible paint. For forgings packed in boxes, the mark can be printed on a label that can be firmly attached to the packaging box or marked on the packaging box.
6.13 The delivered forgings shall be accompanied by a forging quality certificate. The contents include: manufacturer name or code;
part name and part number;
supply status;
steel grade and melting furnace number;
chemical composition, mechanical properties and other test results; number of forgings and single piece weight;
JB/T6031-92
9. Seal of the quality inspection department and signature and certification of the inspection personnel. 6.2 Packaging, transportation and storage
The anti-expansion treatment, packaging, transportation and storage of forgings shall be stipulated in the technical agreement or production contract. Additional remarks:
This standard was proposed and managed by the Tianjin Engineering Machinery Research Institute of the Ministry of Machinery and Electronics Industry. This standard was drafted by the Tianjin Engineering Machinery Research Institute of the Ministry of Machinery and Electronics Industry. The main drafter of this standard is Yang Chengshan.
People's Republic of China
Mechanical Industry Standard
Engineering Machinery
General Technical Conditions for Steel Die Forgings
JB/T 6031--92
Published and distributed by the Mechanical Standardization Research Institute of the Ministry of Machinery and Electronics Industry Printed by the Mechanical Standardization Research Institute of the Ministry of Machinery and Electronics Industry (PO Box 8144, Beijing 100081)
No reproduction is allowed
Copyright reserved
Format 880×1230
Sheet 3/4
First edition in October 1992
Word count 14.000
First printing in October 1992
Print run 00,001-500
Price 2.40 yuan
No. 09653 Inspection batches of forgings
There are two types of inspection batches of forgings: one is composed of plated parts with the same part number, the same smelting furnace number, the same heat treatment furnace and the same production batch, and the other is composed of forgings with the same part number, the same steel grade and the same heat treatment specification. The first batch and single-piece forgings should be fully inspected according to the items in Table 7, and forgings with regular batch production and stable process should be sampled. 5.4 Re-inspection regulations
5.4.1 When it is confirmed that the unqualified results of the mechanical properties test are caused by improper heat treatment, the forgings and the samples can be re-heat treated and then sampled for testing. The number of repeated heat treatments shall not exceed two times, but the number of tempering is unlimited. The number of samples is the same as the first time. 5.4.2 If it is found that the overheated fracture and the macrostructure are in a coarse grain state, it is allowed to re-heat treat and re-batch and submit for acceptance. 6 Marking, packaging, transportation and storage
6.1 Marking and certificate
6.1.1 All forgings that have passed the inspection shall be marked. The content of the mark is generally part number, factory mark, smelting number, steel grade, work order number (combination number), heat treatment furnace number, etc.
6.1.2 Large and medium-sized parts shall be marked at prominent locations (or locations specified by the purchaser). Small batches of forgings can be labeled in batches. The labels can be made of aluminum plates or thin steel plates, or written with indelible paint. For forgings packed in boxes, the marks can be printed on labels that can be firmly attached to the packaging box or marked on the packaging box.
6.13 The delivered forgings shall be accompanied by a forging quality certificate. The contents include: manufacturer name or code;
part name and part number;
supply status;
steel grade and melting furnace number;
chemical composition, mechanical properties and other test results; number of forgings and single piece weight;
JB/T6031-92
9. Seal of the quality inspection department and signature and certification of the inspection personnel. 6.2 Packaging, transportation and storage
The anti-expansion treatment, packaging, transportation and storage of forgings shall be specified in the technical agreement or production contract. Additional remarks:
This standard was proposed and managed by the Tianjin Engineering Machinery Research Institute of the Ministry of Machinery and Electronics Industry. This standard was drafted by the Tianjin Engineering Machinery Research Institute of the Ministry of Machinery and Electronics Industry. The main drafter of this standard is Yang Chengshan.
People's Republic of China
Mechanical Industry Standard
Engineering Machinery
General Technical Conditions for Steel Die Forgings
JB/T 6031--92
Published and distributed by the Mechanical Standardization Research Institute of the Ministry of Machinery and Electronics Industry Printed by the Mechanical Standardization Research Institute of the Ministry of Machinery and Electronics Industry (PO Box 8144, Beijing 100081)
No reproduction is allowed
Copyright reserved
Format 880×1230
Sheet 3/4
First edition in October 1992
Word count 14.000
First printing in October 1992
Print run 00,001-500
Price 2.40 yuan
No. 0965
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