Some standard content:
GB/T8263--1999
This standard is equivalent to all grades except Grade I C Ni.Cr-GB in the American ASTMA532/A532M-93a "Standard Specification for Abrasion-Resistant Cast Irons". According to the actual situation of wear-resistant white cast iron production in my country, two grades KmTBCr2 and KmTBCr8 are added, and their performance is equivalent to the similar grades in the American ASTMA532M93a. This standard is a revision of GB/T8263-1987 "Technical Conditions for Wear-Resistant White Cast Iron". The following contents have been changed: the two grades KmTBMn5W3 and KmTBW5Cr4 have been removed. The two grades KmTBCr8 and KmTBCr12 have been added. The two grades KmTBCr15Mo-DT and KmTBCr15Ma-GT have been merged into one grade. - The chemical composition has been revised. In addition to the Rockwell hardness value (HRC), the Brinell hardness value (HB) is added to the hardness regulations: 1. The regulations on the appearance quality of castings are added. Except for those with special requirements, the dimensional tolerance and weight tolerance of castings shall be implemented in accordance with (GB/T6414--1999 "Dimensional Tolerance and Machining Allowance of Castings" and GB/T113511989 "Weight Tolerance of Castings". The surface roughness of castings shall be implemented in accordance with GB/T6060.1-1997 "Surface Roughness Comparison Sample Casting Surface". From the date of implementation of this standard, it will replace GB/T8263-1987. Appendix A and Appendix B of this standard are both standard appendices. This standard is proposed by the State Machinery Industry Bureau This standard is under the jurisdiction of the National Casting Standard Promotion Technical Committee: The responsible drafting units of this standard are: Shenyang Foundry Research Institute, Guangzhou Nonferrous Metals Research Institute Wear-resistant Materials Machinery Research Institute, Shijiazhuang Pump Factory, Ministry of Electric Power Wear-resistant Parts Quality Inspection Center, Ningguo Wear-resistant Materials General Factory. The main drafters of this standard are: Qi Xiaobing, Li Wei, Zhang Shangang, Sun Zhengguo, Chen Zongming, Pu Dongxue, Chen Changshun. 1 Scope
National Standard of the People's Republic of China
Abrasion-resistant white cast iron parts
Abrasion-resistant white iron castingsGB/T 8263. 1999
Replaces GB/T 8263--1987
This standard specifies the product grades, technical requirements, test methods, inspection rules, packaging, marking and transportation of nickel-chromium alloy wear-resistant white iron castings and chromium alloy wear-resistant white iron castings. This standard is applicable to abrasive wear parts in industries such as metallurgy, building materials, electricity, construction and machinery. Other types of wear-resistant white iron castings can also be implemented as a reference.
2 Referenced 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. Determination of carbon content in steel and alloys
GB/T 223. 1-19814
GB/T 223. 2--1981
Determination of sulfur content in steel, iron and alloy
Diantipyryl methane phosphomolybdic acid gravimetric method for determination of phosphorus content GB/T 223.3-1988
3 Chemical analysis methods for steel, iron and alloys
GB/T 223.12- 1991
GB/T 223.18--1994
GB/T 223.23—1994
GB/T 223.25--1994
GB/T 223.26-
—1989
GB/T 223.60--1997
GB/T 223.63-
GB/T 230--1991
GB/T 231--1984
Methods for chemical analysis of iron, steel and alloys Sodium carbonate separation-diphenylcarbazide photometric method for determination of chromium content Sodium thiosulfate separation-iodine method for determination of copper content Chemical analysis of iron, steel and alloys Diacetyl spectrophotometric method for determination of nickel content Chemical analysis of iron, steel and alloys
Diacetyl gravimetric method for determination of nickel content
Methods for chemical analysis of iron, steel and alloys thiocyanate direct photometric method for determination of copper content Chemical analysis of iron, steel and alloys Perchloric acid dehydration gravimetric method for determination of silicon content Chemical analysis of iron, steel and alloys Sodium (potassium) periodate photometric method for determination of manganese content Metal Rockwell hardness test method
Metal Brinell hardness test method
GB/T 5611—1998
GB/T 5612--- 1985
Casting terms
Method of expressing cast iron grades
GB/T 6060. 1—1997
GB/T 6414-1999
GB/T 11351--1989
GB/T 15056--1994bzxZ.net
3 Definitions
Surface roughness comparison specimen Casting surface
Dimensional tolerances and machining allowances of castings
Weight tolerances of castings
Casting surface roughness
Evaluation method
This standard adopts the following definitions:
3.1 Abrasive wear
Damage caused by material migration due to the action of hard particles or protrusions. Approved by the State Administration of Quality and Technical Supervision on September 3, 1999 29.1
Implemented on March 1, 2000
Wear-resistant white cast iron
GB/T 8263-1999
Carbon is mainly distributed in the metal matrix in the form of carbides and has good resistance to abrasive wear. 3.3 Nickel-chromium alloy wear-resistant white cast iron
Wear-resistant white cast iron with nickel and chromium as the main alloying elements. 3.4 Chromium alloy wear-resistant white cast iron
Wear-resistant white cast iron with chromium as the main alloying element. 4 Grades
According to the chemical composition of wear-resistant cast iron, 9 grades are specified, see Table 1 Grades and chemical composition of wear-resistant white cast iron Table 1
Grades!
KmTBNi4Cr2-DT
KmTRNi4Cr2-GT
KmTBCr9Ni5
KmTBCr2
KmTRC r8
KmTBCr12
KmTBCr15Mo2)
KmTBCr20Mo21
KmTBCr26
3.03.6 0.8
2. 1~~3. 6
2.1~3.21.5~2.2
Chemical composition
7. 0~~11. 0
1.5~3.0
7. 0~11. 0
11.0～14.0
14. 0~18. 0
23. 0-30. 0
$2.0 1 50. 06
1) In the grade, "DT\ and "GT\ are the Chinese phonetic capital letters of "low carbon" and "high carbon\ respectively, indicating the high and low carbon content of the grade. 2) Under normal circumstances, the grade should contain molybdenum (Mo). 5 Technical requirements
5.1 Manufacturing
5.1.1 Wear-resistant self-mouth cast iron can be smelted by any suitable smelting method and produced by any suitable casting method. 5.1.2 If certain parts of the casting need to be locally strengthened or have other special requirements, the purchaser shall state in advance and provide clearly marked drawings.
5.2 Heat treatment
5.2.1 The castings can be made in the following conditions Supply in the following states:
a) As cast;
b) As cast and stress relief treatment;
c) Hardened;
d) Hardened and stress relief treatment;
e) Soft annealed state.
For the heat treatment specifications of wear-resistant white cast iron parts, please refer to Appendix A (Appendix to the standard). 5.2.2 Unless otherwise specified by the supplier and the buyer, the supplier may select the heat treatment specifications and supply states that the supplier considers to be most beneficial for use based on the technical requirements and use conditions of the castings.
5.2.3If the supply state specified by the supplier and the buyer is not the final use state of the casting (for example, it is specified to supply in the soft annealed state in GB/T 8263 --1999
for the convenience of mechanical processing), the heat treatment required for the use of the castings shall be implemented by the buyer. 5.3 Chemical composition
The chemical composition of wear-resistant white cast iron parts shall comply with the provisions of Table 1. 5.4 Metallographic structure
Generally, the metallographic structure is not used as the basis for product acceptance. If the purchaser has special requirements for the metallographic structure, it shall be agreed upon by the supply and demand parties. The conventional metallographic structure of wear-resistant white cast iron parts can refer to Appendix B (Appendix to the standard). 5.5 Hardness
The hardness of wear-resistant white cast iron parts shall comply with the provisions of Table 2. Table 2 Hardness of wear-resistant white cast iron parts
KmTBNi4Cr2-DT
KmTBNi4Cr2-GT
KmTBCr9Ni5
KmTBCr2
[KmTBCr8
KnTBC12
KmTBCr15Mo
KmTBCr20Mo
KmTBCr26
As-cast or as-cast and stress-relieved|| tt||≥550
≥550
≥450
≥450
Hardened or hardened and stress relieved
≥600
≥600
≥650
≥600
Softened annealed
Note: There is no exact correspondence between Rockwell hardness value (HRC) and Brinell hardness value (HB), therefore, these two hardness values should be used independently. HB
5.6 Castings are not allowed to have cracks and casting defects such as slag inclusion, sand inclusion, cold shut, pores, shrinkage, shrinkage, lack of meat, etc. that affect the performance. 5.7 The gate, riser, flash burr, sticky sand, etc. of the casting should be cleaned, and the residual amount of the gate and riser grinding should meet the provisions recognized by both the supply and demand parties.
5.8 The surface roughness of the casting shall comply with the requirements of the drawing or order contract. If there is no requirement in the drawing or order contract, the surface roughness of the casting shall meet the requirements of Ra25 in GB/T6060.1. 5.9 During the cleaning and treatment of casting defects, flame cutting, arc gouging cutting, electric welding cutting and welding repair are not allowed. 5.10 The geometry, size, weight and tolerance of the casting shall comply with the requirements of the drawing or order contract. If there is no requirement in the drawing or order contract, the dimensional tolerance of the casting shall meet the requirements of CT13 in GB/T6414-1999. The weight tolerance of the casting shall meet the requirements of MT13 in GB/T11351-1989.
6 Test methods
6.1 The analysis method of chemical composition shall be carried out in accordance with GB/T223.1, GB/T223.2, GB/T223.3, GB/T223.12, GB/T223.18, GB/T223.23, GB/T223.25, GB/T223.26, GB/T223.60 and GB/T223.63. Spectroscopic analysis, X-ray analysis and other analysis methods with accurate and reliable analysis results may also be used. 6.2 Rockwell hardness test shall be carried out in accordance with GB/T230. 6.3 Brinell hardness test shall be carried out in accordance with GB/T231. 6.4 Surface roughness test method shall be carried out in accordance with GB/T6060.1 and GB/T15056. 236
7 Inspection rules
7.1 The quality of castings shall be inspected by the supplier's quality inspection department. 7.2 Chemical composition test
GB/T 8263--1999
7.2.1 When electric furnace smelting is adopted, each furnace (time) is regarded as a batch; when cupola smelting is adopted, every 2 hours is regarded as a batch. Take one sample from each batch for chemical composition test.
7.2.2 If the test result is unqualified, double sampling and re-testing shall be carried out. If one sample is still unqualified, the castings of this batch shall be unqualified.
7.3 Hardness test
7.3.1 Hardness shall generally be tested on the casting body, and the test site shall be selected from the main working part of the casting. When it is difficult to test the hardness on the casting body, it can also be tested on the sample. The preparation of the sample shall be agreed by the purchaser. 7.3.2 Hardness test is carried out in batches. The batches are divided into the following three ways. The specific requirements are agreed upon by the supply and demand parties. a) According to the furnace, the same type, cast from the same furnace, and heat treated in the same furnace (if heat treatment is required) are considered as one batch.
b) According to quantity or weight, the same brand is cast in several furnaces under the condition of stable smelting process and heat treated in multiple furnaces with the same process (if heat treatment is required), with a certain number or a certain weight of castings as a batch. c) According to the piece, when there are special technical requirements for some castings, one or several pieces are considered as one batch. 7.3.3 Three pieces (or three samples) are randomly selected from each batch for inspection. If one piece fails, the same number of castings (samples) can be randomly selected for re-inspection. If the number of unqualified castings (samples) in two samplings is greater than or equal to 2, the castings in this batch are considered unqualified. If there are 2 unqualified pieces in the first sampling, the castings in this batch are considered unqualified. When batching by piece, the sampling method shall be agreed upon by both parties. 7.3.4 When the hardness of the heat-treated casting is unqualified, it is allowed to repeat the heat treatment. 7.4 The size, weight, tolerance and appearance quality of the casting shall be inspected piece by piece or sampled according to the method agreed upon by both parties. 8 Marking, storage, packaging and transportation
8.1 Marking and quality certificate
8.1.1 Each casting surface shall be marked with the following marks or part of them. Such as: a) "mark;
b) batch number:
c) other marks required by the purchaser.
When it is impossible to make a mark on the casting, the mark can be printed on the label attached to each batch of castings. 8.1.2 Castings leaving the factory should be accompanied by a product certificate stamped by the inspection department. The certificate should include: a) Supplier name:
b) Casting name (material brand);
c) Inspection results;
d) Casting drawing number or order contract number;
e) Manufacturing date (or number) or production batch number. 8.2 Storage, packaging and transportation
Castings should be protected and packaged after passing the inspection. Casting protection, storage, packaging and transportation should comply with the provisions of the order contract. 297
GB/T 8263-1999
Appendix A
(Suggested Appendix)
Heat treatment specifications for wear-resistant white cast iron parts
The heat treatment specifications for wear-resistant white cast iron parts are related not only to the chemical composition of the castings, but also to factors such as their structure, wall thickness, furnace loading, quantity and use conditions. In actual production, the heat treatment specifications for castings can be formulated according to specific conditions with reference to Table A1. Table A1 Heat treatment specifications for wear-resistant white cast iron parts Grade
KmTBNi4Cr2-DT
KmTBNi4Cr2-GT
KmTBCr9Ni5
KmTBCr2
KmTBCr8
KmTBCr12
KmT1Cr15M
KmTBCr20Mo
KmBCr26
Softening annealing
940~960℃ for 1~6h, slow cooling
to 750~780℃ for 4h ~6h, slow cooling
to below 600℃, take out of the furnace and cool in air or furnace
920~-960C, keep warm for 1~8h, slow cooling
to 700~750C, keep warm for 4~8h, slow cooling
to below 600℃, take out of the furnace and cool in air or furnace
920960C, keep warm for 18h, slow cooling
to 700~750C, keep warm for 4~8h, slow cooling
to below 600℃, take out of the furnace and cool in air or furnace
920~960C Keep warm for 1~8h, slowly cool
to 700~750C and keep warm for 4~8h, slowly cool
to below 600℃ and air cool or furnace cool
Keep warm at 960-1000℃ for 1~8h, slowly
cool to 700~750℃ and keep warm for 4~10h,
slowly cool to below 600℃ and air cool or furnace cool
Hardening treatment
430~470 Keep warm for 4~6h,
and air cool or furnace cool
750 ～825℃ Keep warm for 4~10
h, and air cool or furnace cool
960～1 000 C Keep warm for 1～ 6
h,Air cooling after coming out of the furnace
Keep warm at 940~980℃ for 2~6h,
Enter the salt bath at 260~320℃
Furnace isothermal for 2~6h, air cooling after coming out of the furnace
Keep warm at 920~980℃ for 2~6h
Air cooling after coming out of the furnace
Keep warm at 920~1 000C for 2~6
h, air cooling after coming out of the furnace
Keep warm at 960~1 020C for 26
h, air cooling after coming out of the furnace
Keep warm at 960~1 060C for 2 ~
h, air cooling after furnace removal
High stress treatment
Keep warm at 250～300℃ for 1~
16h, air cooling or furnace cooling after furnace removal
Keep warm at 250~300C for 4
16h, air cooling or furnace cooling after furnace removal
Keep warm at 200-~300℃ for 2~6h,
Keep warm at 200-~ 300℃ for 2~6h h,
Air cooling and furnace cooling after furnace removal
Keep warm at 200~300℃ for 2~8h
Air cooling or furnace cooling after furnace removal
Keep warm at 200~300C for 2~8h,
Air cooling or furnace cooling after furnace removal
Keep warm at 200~-300℃ for 2~8h
Air cooling or furnace cooling after furnace removal
GB/T 8263--1999
Appendix B
(Suggestive Appendix)
Metallographic structure and use characteristics of wear-resistant white cast iron castingsThe metallographic structure and use characteristics listed in Table B1 refer to general situations and are for reference during use. Table B1
KmTBNi4Cr2-DT
KmTBNi4Cr2-GT
KmTBCr9Ni5
KmTBCr2
KmTBCr8
KmTBCr12
KmTBCr15Mo
KmTBCr20Mo
KmTBCr26
Metallographic structure
As-cast or as-cast and stress-relieved
Eutectoid carbide M.C + martensite
Ten shells Eutectic carbide (M, C + a small amount
MC) + martensite + austenite
Eutectoid carbide M:C + pearlite
Eutectoid carbide (M, C + a small amount
MC> + fine pearlite
Eutectoid carbide M, C + austenite
and its transformation products
Hardened state or hardened state and stress relief treatment
Usage characteristics
Can be used for grinding with medium impact load
Eutectoid carbide MC + martensite
Original material wear ||t t||+Bainite+Retained Austenite
Eutectoid Carbide (M, Cs+A Small Amount
M, C)+Secondary Carbide+Martensite
+Retained Austenite
Eutectoid Carbide M.C+Secondary Carbide
Carbide+Martensite+Retained Austenite
Eutectoid Carbide (M, C,+A Small Amount
M:C)+Secondary Carbide+Bainite
+Martensite+Austenite
Eutectoid Carbide M, CsTwelve Secondary Carbide
Carbide+Martensite+Retained Austenite
Eutectoid Carbide M, CsTwelve Secondary Carbide
Carbide+Martensite+Retained Austenite
Eutectoid Carbide Eutectic carbide M.C++austenite
and its transformation products
Eutectoid carbide M,Ca+austenite
and its transformation products
Eutectoid carbide MC:+austenite
Eutectoid carbide M,C3+secondary carbide
decomposition+martensite+retained austenite
Eutectoid carbide M,C3+secondary carbide+martensite+retained austenite
Eutectoid carbide M,C,+secondary carbide
decomposition+martensite+retained austenite
Note: M in metallographic structure Represents metal atoms such as Fe, Cr, etc. C represents carbon atoms. Abrasives used for smaller impact loads have good permeability, and can be used for abrasive wear with medium impact loads. Abrasives used for smaller impact loads have certain corrosion resistance, and can be used for abrasive wear with medium impact loads. Abrasive wear with medium impact loads can be used for abrasive wear with medium impact loads. Abrasive wear with medium impact loads has good hardenability. Has good corrosion resistance. Can be used for abrasive wear with larger impact loads. Has good hardenability. Has good corrosion resistance and high temperature oxidation resistance. Can be used for abrasive wear with larger impact loads., can be used for abrasive wear with medium impact load. Can be used for abrasive wear with medium impact load. Can be used for abrasive wear with medium impact load. Has good hardenability. Has good corrosion resistance. Can be used for abrasive wear with large impact load. Has good hardenability. Has good corrosion resistance and high temperature oxidation resistance. Can be used for abrasive wear with large impact load., can be used for abrasive wear with medium impact load. Can be used for abrasive wear with medium impact load. Can be used for abrasive wear with medium impact load. Has good hardenability. Has good corrosion resistance. Can be used for abrasive wear with large impact load. Has good hardenability. Has good corrosion resistance and high temperature oxidation resistance. Can be used for abrasive wear with large impact load.
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.