JB/T 9178.1-1999 JB/T 9178.1-1999 General technical conditions for open forgings on hydraulic presses JB/T9178.1-1999 Standard download decompression password: www.bzxz.net

ICS25.020
Standard of the Machinery Industry of the People's Republic of China
JB/T9178.1-1999
General specifications for open die forgings on hydraulic press
General specifications for open die forgings on hydraulic press1999-06-24Published
National Bureau of Machinery Industry
Implemented on 2000-01-01
JB/T9178.1-1999
This standard is a revision of ZBJ32001-88 "General specifications for open die forgings on hydraulic press". This standard has some changes from ZBJ32001-88 in the following major technical contents:1) The forging grades in Table 1 have been adjusted according to the requirements of GB/T12363-1990 "Functional classification of forgings", and the original I-grade forgings have been changed to V-grade forgings.
2) Table 2 "Longitudinal mechanical properties of forgings of some commonly used materials" has been revised, and some unused steel grades have been cancelled. This standard replaces ZBJ32001-88 from the date of implementation. Appendix A of this standard is the appendix of the standard.
This standard is proposed and managed by the National Technical Committee for Forging Standardization. The responsible drafting unit of this standard: Shanghai Zhengsheng Forging Co., Ltd. The main drafters of this standard: Zhu Zaizhang and Zhao Qi. Machinery Industry Standard of the People's Republic of China
General specifications for open die forgings on hydraulic press1 Scope
This standard specifies the general technical conditions for open die forgings on hydraulic press. JB/T9178.1-1999
Replaces ZBJ32001-88
This standard applies to carbon steel and alloy steel forgings for general industrial use, and does not apply to forgings for special purposes or with special requirements. 2 Reference Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T222—1984
GB/T223.1~223.771981~1994
GB/T 226—1991
GB/T228—1987
GB/T 229—1994
GB/T231—1984
GB/T23 2—1988
GB/T699—1988
GB/T700—1988
GB/T1220—1992
GB/T1221-1992
GB/T1298—1986
GB/T 1299—1985
GB/T1591—1994
GB/T1814—1979
GB/T1979—1980
GB/T2975—1998
GB/T3077—1988
GB/T 7736—1987
GB/T10561—1989
GB/T13298—191
JB/T4009—1999
JB/T9179.1~9179.8—1999
1999-06-24 approved by the State Bureau of Machinery Industry Sampling method for chemical analysis of steel and allowable deviation of chemical composition of finished products Chemical analysis method of steel and alloy
Macrostructure and defect acid etching test method of steel Metal tensile test method
Metal Charpy notch impact test method
Metal Brinell hardness test method
Metal bending test method
Technical conditions for high-quality carbon structural steel
Carbon structural steel
Stainless steel bar
Heat-resistant Steel bars
Technical conditions for carbon tool steel
Technical conditions for alloy tool steel
Low alloy high strength structural steel
Fractograph test method for steel
Grading diagram of macrostructure defects in structural steel
Sampling location and specimen preparation for mechanical properties test of steel and steel productsTechnical conditions for alloy structural steel
Macrostructure and defects of steelUltrasonic test method for microscopic evaluation of non-metallic inclusions in steelMetallic microstructure test method
Contact ultrasonic direct flaw detection method
Machining allowance and tolerance of free forgings on hydraulic press2000-01-01Implementation
YB/T5148—1993
3 Technical elements
3.1 Ordering conditions
3.1.1 Quantity and material of required forgings.
3.1.2 The buyer shall provide part drawings and rough processing drawings JB/T9178.1-1999
Method for determination of average grain size of metals
3.1.2.1 If the buyer only provides part drawings, the heat treatment requirements (allowance), the size and position of the process chuck and the test bar shall be indicated on the drawings.
3.1.2.2 If the buyer only provides rough processing drawings, the size and position of the part, the size of the process chuck and the test bar shall be indicated on the drawings. 3.1.2.3 If the buyer's drawings do not have the above provisions, the supplier's process provisions shall apply. 3.1.3 The buyer shall specify the forging grade in the contract (see Table 1). If no grade is specified, the forgings shall be delivered as Grade V. The buyer may propose additional requirements beyond those specified in 3.3 [see Appendix A (Standard Appendix) 1 when placing an order and indicate them in the contract. Table 1 Test items and inspection quantity of forging grade Basic mark of forging grade Inspection characteristics Conditions for forming batches Determine the hardness and mechanical properties of each forging Determine the hardness of each forging and the mechanical properties of the same melt forged in the same furnace heat treatment in each batch Determine the hardness of each forging Determine the hardness of the forgings in each batch No test Forgings of the same furnace number Each forging is tested individually Forgings of the same heat treatment furnace and steel grade Acceptance mechanical properties Oh, O, Os #Ak , HB
, Ak, HB
Number of tests
Tensile, impact test
Every forging is tested
2 pieces are tested in each batch
Hardness test
Every forging is tested
Every forging is tested
Every forging is tested
2 pieces are tested in each batch
1The hardness value of grade I and II forgings is not used as the basis for acceptance: the mechanical property index items for acceptance can be agreed upon by the supply and demand parties when necessary. 2The test bar is generally left on the forging. Under special circumstances, it can be forged separately with the approval of the demander, but it must use the same furnace molten steel as the forging it represents, have the same forging ratio and forging method, and be heat treated in the same furnace. 3.2 Forging Manufacturing
3.2.1 Forging steel shall be killed steel, and its chemical composition shall comply with the provisions of GB/T699, GB/T700, GB/T1591, GB/T3077GB/T1298, GB/T1299, GB/T1221 and GB/T1220. Steel grades other than GB/T1298 shall be in accordance with the contract. 3.2.2 Forging steel ingots or steel bars shall have a certificate of conformity. 3.2.3 Before forging, all surface defects that affect the quality of forgings must be removed from the steel ingots and steel bars. When forging steel ingots, there should be sufficient removal at both ends.
3.2.4 During the production of forgings, heating, forging, cooling after forging, heat treatment, calibration, etc. shall be carried out in accordance with the supplier's process specifications. Important forgings shall have necessary technical records.
3.2.5 Forgings shall have sufficient deformation to ensure that the quality requirements of forgings are met. 3.3 Technical requirements
JB/T9178.1-—1999
3.3.1 The machining allowance and tolerance on the forging drawing shall comply with the provisions of JB/T9179.1~9179.8. If the purchaser has special requirements, they shall be in accordance with the contract provisions.
3.3.2 The shape and size of the forging shall comply with the provisions of the forging drawing. 3.3.3 Forgings are divided into five levels, I, II, III, IV, and V, according to their use and working conditions, and the test type is in accordance with the provisions of Table 1.
3.3.4 The surface of the forging should not have defects such as cracks, shrinkage holes, folds, interlayers, forging scratches, etc. If there are defects, they shall be handled in accordance with the following provisions. 3.3.4.1 For the surface of forgings that do not require machining, the maximum depth after trimming shall not exceed the minimum solid dimension of the dimension at that location. 3.3.4.2. For forging surfaces that require machining, if the remaining single-sided machining allowance on the forging is not less than 50% of the nominal single-sided allowance, this defect may not be removed; if it is less than 50%, it must be removed. 3.3.4.3. If the depth of the surface defect of the forging exceeds the single-sided machining allowance, the defect may be removed and welded according to the supplier's process specifications, subject to the purchaser's consent. The quality of the weld repair shall meet the purchaser's requirements for the quality of forgings. 3.3.5. Forgings with white spots shall be scrapped, and forgings with the same furnace number and heat treatment as the forging shall be inspected one by one. 3.3.6. The mechanical properties (longitudinal) shall comply with the provisions of Table 2 or the contract, and the percentage of radial, transverse and tangential mechanical properties allowed to be reduced shall be in accordance with the provisions of Table 3.
3.3.7. Upon the purchaser's request, additional tests beyond the requirements of this chapter may be carried out when the forgings are delivered (see Appendix A), but the acceptance conditions shall be stated in the contract.
should generally be left at the riser end or bottom end of the ingot. 3.3.8
Specimen 1
Table 2 Longitudinal mechanical properties of forgings of common materials Heat treatment
Sectional size
≤100
>100~250
>250~500
>500~1000
≤100
>100~250
>250~500
>500~1000
≤100
>100~250
>250~500
>500~1000
≤100
>100~250
>250~500 | |tt | 80 ~ 520 | | tt | | 480 ~ 670 | | tt | | 460 ~ 650 | | tt | | 460 ~ 610 | | tt | 6
126~170
143-187
196~241
187~229
163~219
20SiMn
35SiMn
20MnMo
Heat treatment
Section size||tt| | ≤ 100 | | tt | | > 100 ~ 250 | | tt | | > 250 ~ 500 | -~500
>500~1000
≤100
>100~250
>250~500
≤100
>100~300
>300~500
≤120
>120~250||t t||>250~400
>400~600
>600-900
>900~1200
≤100
>100~300
>300~400
>400~500
>500-800| |t t|| ≤ 300 | tt||560 ~ 720 ||tt | 63 0 ~ 780 | | tt | | 630-780 | | tt | | AkunAky | t||197 ~ 269 | | tt | | 116 ~ 179 | | tt | | 229-286 | | tt | （18MnMoNb）
42MnMoV
37SiMn2MoV
15CrMo
25CrMo
35CrMo
42CrMo
Heat treatment
Normalizing + tempering
Section size
≤300
>300~500
>500-800
>100~300
>300~500
>500~800
≤100
>100~300
>300~500
>500~ 800
≤100
>100~300
>300~500
>500-800
≤100
>100-300
≤300
≤100
>100~160
≤1 00
>100~300
>300~500
>500~800
≤100
>100~160
>160~250
>250~500
>500~750
JB/T9178.11999
Table 2 (continued)
Mechanical properties》
0(0a2)
0 (or =)
700~850||tt| |650-800
900~1100
800~950
750~900
690-840
590-740
AkunAky
187~229
187-229
2 41~286
229~269
217~241
269-302
241~286
241-286
241~ 286
241~286
229~269
217~255
255~286
241-286
116-179| |tt||209~269
50CrMo| |tt||38CrMoAlA
30Cr2Ni2Mo
34CrNiMo
34CrNi3Mo
28CrNi2MoV
Heat treatment
Normalizing + tempering
Section size
≤100
>100~160
>160~250
>250~500
>500~750
≤100
> 100~300
≤100
>100~300
>100~300
≤100
>100~160
> 160~250
>250~500
>500~1000
≤100
>100~160
>160~250||tt| |>250~500
>500~1000
≤10 0
>100~300
>300~500
>500~1000
>500~1000
>1000~1500||tt| |JB/T9178.11999
Table 2 (End)
Mechanical properties
0(0a2)
0h (or =)
900~1100
850~1000
800~950
7 40~890
690~840
1100-1300
1000~1200
900-1100
830-980
780- 930
1000-1200
900-1100
800~950
740~890
690~840
780~930| |tt||740~890||tt| |690~840
AkunAky
207-241
229-269www.bzxz.net
220~260
269~319
262~312
241-291
241-291
Mechanical properties
a, (MPa)
a (MPa)
JB/ T9178.1-1999
Table 3 Radial, transverse and tangential mechanics Percentage of allowable reduction in performancePercentage of allowable reduction in mechanical properties%
Transverse specimen
3.4 ​​Test method and acceptance rules
Radial specimen
Tangential specimen| |tt||Forgings with diameter ≤ 300mm
Forgings with diameter > 300mm
3.4.1 The inspection of appearance, shape and size of forgings shall be carried out by the supplier's quality inspection department according to the requirements of the forging drawings; other tests If the supplier is not qualified, the quality inspection department of the purchaser may also carry out the inspection, but this should be noted in the contract. If necessary, both parties shall conduct re-inspection. 3.4.2 Provisions on the location of cutting forging mechanical properties test specimens. 3.4 .2.1 Circular shafts: Longitudinal sampling is taken from the end face at 1/3 of the radius from the outer circle; radial specimens are taken from the end face in the radial direction; tangential specimens are taken from the outer circle of the end face.
3.4.2.2 Rectangular type: Both longitudinal and transverse specimens are taken from the end face at 1/6 of the diagonal from the outer surface. 3.4.2.3 Cylinder type: When the wall thickness is 100mm or less, the longitudinal specimen is taken From the end face at 1/2 wall thickness; when the wall thickness exceeds 100mm, the longitudinal specimen is taken from the end face at 1/3 wall thickness from the outer circle; the tangential specimens are all taken from the outer circle of the end face, and the cross section is twice the wall thickness.
3.4.2.4 Rings and discs: The tangential specimen is taken from the outer circle of the end face. For rings and discs with holes, the wall thickness and height are used to determine the mechanical properties. The smaller of the two shall be used as the cross-sectional dimension to determine the mechanical property value. 3.4.2.5 Forgings of special shapes: If the purchaser's drawing does not specify the cutting position, the supplier shall determine it. 3.4.3 The cutting method of the specimen shall be in accordance with GB/T2975 Regulations shall be implemented. 3.4.4 Tensile test, impact test and Brinell hardness test shall be carried out in accordance with the provisions of GB/T228, GB/T229 and GB/T231. 3.4.5 The number of specimens for mechanical property test of forgings shall be 1 tensile specimen in each test group. 3.4.6 If one or more of the mechanical properties test indicators fail to meet the requirements, double the number of samples shall be taken for a second test of the failed items. Even if the performance of one sample is lower than the requirement, the batch of forgings must be reheat treated, but the total number of times shall not exceed 3. Supplementary tempering cannot be considered as reheat treatment, and the number of times is unlimited. 3.4.7 Reheat treatment or After additional tempering, retest according to the provisions of 3.4.3, 3.4.4 and 3.4.5. 3.4.8 White spots shall be checked by ultrasonic or low-power test, and confirmed by fracture inspection when necessary. The test and inspection methods shall be carried out in accordance with the provisions of JB/T4009, GB/T7736, GB/T226, GB/T1979 and GB/T1814. 4 Marking and Certificate
4.1 Forgings that pass the inspection shall be marked with The required mark is printed on the designated part of the process. The general content of the printed mark: work order number (contract number), drawing number, steel grade, furnace number, supplier mark, etc. The mark can be punched or painted with indelible paint. Brush on. JB/T9178.1-1999
The delivered forgings shall be accompanied by a certificate of forging inspection, including: 4.2
a) Name of supplier:
b) Work order No. (Contract No.), Drawing No., Forging Name: c) Quantity and Unit Weight of Forgings:
d) Steel Grade and Furnace No.:
e) Chemical Composition and Test Results:
f) Delivery status:
g) Seal of the quality inspection department, signature and date of the inspector. 8
JB/T9178.1-1999
Appendix A
(Standard Appendix)
Additional requirements
Additional requirements required by the purchaser, by The effective chemical composition is the one that is specified in the contract after the supply and demand parties agree on the acceptance conditions. The chemical composition analysis of forgings can be carried out in accordance with the provisions of GB/T222 and GB/T223. Bending test
According to GB/T232
3 Low power test
Test and rating shall be carried out in accordance with the provisions of GB/T226 and GB/T1979. 4 High power test
Carry out the test and rating in accordance with the provisions of YB/T5148, GB/T10561 and 5 Ultrasonic flaw detection
shall be carried out in accordance with the provisions of JB/T4009 or GB/T7736. 5 Others
Other test items and requirements proposed by the purchaser. 9
People's Republic of China
Mechanical Industry Standard
General Technical Conditions for Free Forgings on Hydraulic Presses JB/T9178. 1-1999
Published by the Mechanical Science Research Institute
Printed by the Mechanical Science Research Institute
(No. 2 Shouti South Road, Beijing
100044)
Word count: 20 ,000
Book size 880×1230
1/16 Printing sheet 3/4
First edition in November 1999 First printing in November 1999 Price 10.00 yuan
Print quantity 1-500
299-947
Mechanical industry standard service network: 66826
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.