Some standard content:
GB/T 5680-- 1998
This standard is a revision of GB5680--85 "Technical Conditions for High Manganese Steel Castings" in accordance with the development of science and technology in my country and the need to adapt to international trade, technology and economic exchanges as soon as possible. This standard merges and adjusts several high manganese steel grades in GB5680-85: the original ZGMn13-2 and ZGMn13-4 grades are merged into ZGMn13-2 of this standard; the original ZGMn13-3 grade remains unchanged, and its composition is appropriately adjusted to be suitable for the grade of high manganese steel for railways. In this way, the application field of this standard grade not only includes the scope of GB5680-85, but also has been broadened. This standard imposes mandatory control on the harmful elements S and P in high manganese steel alloys, reduces the content of S and P, and is conducive to improving the quality of high manganese steel castings.
This standard adds ZGMn13-4 and ZGMn13-5 grades. They are equivalent to JIS G5131 SCM n H11 and ANSI / ASTM A128 E-1 grades, which is conducive to the entry of castings produced in my country into the international market. Except for special requirements, the dimensional tolerance and quality tolerance requirements of castings in this standard are implemented in accordance with GB6414 "Dimensional Tolerance of Castings" and GB/T11351 "Weight Tolerance of Castings". The inspection rules of this standard refer to 1SO4990, etc., and the castings with special requirements of the buyer are revised in the form of adding supplementary requirements.
This standard was first issued in 1985.
Appendix A and Appendix B of this standard are both appendices to the standard. From the date of implementation, this standard will replace GB5680-85 at the same time. This standard is proposed by the Ministry of Machinery Industry of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee for Casting Standardization. The drafting units of this standard are: Shanghai Heavy Machinery Factory and Shenyang Heavy Machinery Factory. The main drafters of this standard are: Wang Shimin, Han Xingde, and Zhang Yongle. 1 Scope
National Standard of the People's Republic of China
High manganese steel castings
Austenitic manganese steel castingsGB/T 5680--1998
Replaces GB568085
This standard specifies the technical conditions for sand casting high manganese steel castings, and other castings of high manganese steel castings can also be used as a reference (hereinafter referred to as castings).
This standard is used for wear-resistant high manganese steel castings under different degrees of impact loads. 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 version of the following standards. GB222—84 Sampling method for chemical analysis of steel and allowable deviation of chemical composition of finished products GB223.1--81 Determination of carbon content in steel and alloys GB 223.2-81
Determination of sulfur content in steel and alloys
GB223.3—88 Chemical analysis methods for steel and alloys Antipyryl methane phosphoric acid gravimetric method for determination of phosphorus content GB223.4-88 Chemical analysis methods for steel and alloys Ammonium nitrate oxidation volumetric method for determination of manganese content GB/T223.5-1997
Chemical analysis methods for steel and alloys Reduced molybdenum silicate photometric method for determination of acid-soluble silicon content GB/T223.11—91 Chemical analysis methods for steel and alloys Ammonium persulfate oxidation volumetric method for determination of chromium content GB223.26-89 Chemical analysis methods for steel and alloys Determination of molybdenum content by thiocyanate direct photometric method GB/T 223.68-
GB/T 223.69-
GR 228---87
Methods for chemical analysis of iron, steel and alloys Determination of sulfur content by potassium iodate titration after combustion in a tubular furnace Methods for chemical analysis of iron, steel and alloys Determination of carbon content by gas volumetric method after combustion in a tubular furnace Methods for tensile testing of metals
GB 229-1994
GB 231--84
GB232-
GB 5677-
Methods for Charpy notched impact testing of metals
Methods for testing Brinell hardness of metals
Methods for bending testing of metals
Methods for classification of radiographic and negative film grades of steel castingsGB/T 6060.1-
-1997 Comparison specimens for surface roughness Casting surface Tolerances of dimensions of castings
GB 6414-86
GB9443:88 Method for rating steel castings by penetrant flaw detection and defect indication GB/T 11351--89
Tolerance of casting weight
GB 11352-89
-Carbon steel castings for general engineering
GB/T13925--92 Metallographic structure of cast high manganese steel
3 Grades
The high manganese steel used in this standard includes 5 grades: ZGMn13-1; ZGMn13-2; ZGMn13-3; ZGMn13-4; ZGMn13-5. Approved by the State Administration of Quality and Technical Supervision on July 30, 1998. Implementation on July 1, 1999. 4 Technical requirements. 4.1 Manufacturing. GB/T5680—1998. Unless otherwise specified, the steelmaking method and casting process shall be determined by the supplier. 4.2 Chemical composition. The chemical composition of each grade shall comply with the requirements in Table 1. Table 1
Chemical composition
ZGMn13-1
ZGMn13-2
ZGMn13-3
ZGMn13-4
ZGMn13-5
11.00~~14.00 0.30~1.00
1.00~~1.45
0.90~1.3511.00~14.000.30~1.000.95~1.3511.00~14.000.30~0.80Cr
0. 901. 3011. 00~14, 00 0. 30~0. 801. 50~ 2. 500.75~1.3011.00~14.000.30~1.00Note: ZGMn13 is a cast high manganese steel. The Arabic numerals after \-\ indicate the variety code4.3 Heat treatment
0.90~1.20
4.3.1 The casting must be water-toughened.
4.3.2 The casting should be heated and kept warm evenly. The water-toughening temperature should not be lower than 1040℃ to ensure that the carbides in the casting are uniform and dissolved. 4.4 The mechanical properties (yield strength, tensile strength, elongation) of the sample after water-toughening should comply with the provisions of Table A1 in Appendix A (Appendix of the standard).
4.5 Surface quality
4.5.1 The surface of the casting should be flat, the gate, burrs, sand adhesion, etc. should be cleaned up, and the residual amount of the riser cutting should comply with the provisions recognized by both the supply and demand parties. 4.5.2 The surface roughness of the casting shall be selected in accordance with GB6060.1 and shall be indicated in the drawing or order agreement. 4.5.3 Casting defects such as cold shut, cracks, holes, etc. that may damage the use of the casting are not allowed. 4.6 Dimensional tolerance, geometric tolerance
The dimensional tolerance of castings shall not be lower than the provisions of CT13 grade in GB6414--86. If there are special requirements, they shall be specified in the drawing or order. Regarding geometric tolerances, this standard lists the tolerance values in Appendix B (Standard Appendix) for reference and selection. 4.7 Welding repair
4.7.1 Casting defects are allowed to be welded. The defective parts must be cleaned before welding. The welding repair should not affect the use and appearance quality of the casting. 4.7.2 Whether the casting should be water-toughened again after a large-scale welding repair should be agreed upon by both parties. ：4.7.3 Major welding repairs
4.7.3.1 For important parts of important castings, when the groove depth prepared for the welding surface exceeds 20% of the wall thickness or 25mm (whichever is smaller) or the groove area exceeds 65cm2, it is considered a major welding repair. 4.7.3.2 Major welding repairs should have records of welding repair location and scope. The welding conditions are determined by the supplier. If the purchaser has requirements for pre-welding preparation, welding rod material, welding repair process, and post-welding treatment, it should be negotiated with the supplier. After welding repairs, they should be inspected according to the same standards as the castings. 4.8 Correction
Deformation of castings is allowed to be corrected at room temperature after water toughening. 5 Test methods
5.1 Chemical analysis
5.1.1 The chemical composition of castings should be analyzed furnace by furnace according to the smelting furnace. GB/T 5680---1998
5.1.2 The sample (block) for chemical analysis shall be taken from the molten steel in the steel ladle or during pouring. 5.1.3 The sampling method for chemical analysis shall be in accordance with the provisions of GB222. 5.1.4 The method for chemical analysis shall be in accordance with GB223.1, GB223.2, GB223.3,GB223.4, GB/T223.5, GB/T223.11, GB223.26, GB/T223.68, GB/T223.69 shall be followed, or other methods that can ensure the accuracy and reliability of the analysis data shall be followed.
5.2 Surface quality inspection
5.2.1 The surface roughness inspection method of castings shall be carried out in accordance with the provisions of GB6060.1. 5.2.2 The inspection of casting geometry and dimensions shall select the inspection tools, gauge blocks, templates or line inspections of corresponding accuracy. 6 Inspection rules
6.1 Acceptance and authority
It shall be carried out in accordance with the provisions of 6.1 of GB11352--89. 6.2 Inspection location
It shall be carried out in accordance with the provisions of 6.2 of GB11352-89. 6.3 Batch division
Batch division shall be in the following three types, and the specific requirements shall be agreed upon by the supply and demand parties. 6.3.1 Classification by furnace: Castings of the same type, cast from the same furnace, and subjected to the same heat treatment in the same furnace are considered a batch. 6.3.2 Classification by quantity or mass (kg): Castings of the same grade cast from several furnaces under stable smelting process and subjected to multiple heat treatments by the same process are considered a batch with a certain quantity or mass. 6.3.3 Classification by piece: For some castings with special technical requirements, one or several pieces are considered a batch. 6.4 Chemical composition inspection
6.4.1 The chemical composition of castings is analyzed according to the smelting furnace. The smelting analysis shall comply with the provisions of Table 1. 6.4.2 The allowable deviation of the chemical composition of the finished product analysis shall comply with the provisions of Table 2. Table 2
Deviation, %
For sand castings, the chip specimens shall be taken from 6mm below the casting surface. 6.5 Metallographic inspection, mechanical properties and bending inspection 6.5.1 The metallographic inspection shall be carried out in accordance with the provisions of A3 in Appendix A. 6.5.2 Mechanical property test shall be carried out in accordance with the provisions of A4 in Appendix A. Mo
6.5.3 Bending test shall be carried out in accordance with the provisions of A5 in Appendix A. 6.5.4 The manufacturer may select one of 6.5.1, 6.5.2 and 6.5.3 as a mandatory inspection item for product acceptance according to the inspection capabilities of the manufacturer or by agreement with the purchaser.
6.6 Surface quality inspection
The surface quality of castings shall be inspected piece by piece in accordance with the requirements of 4.5. 6.7 Geometric shape and dimensional tolerance
The geometric shape and dimensional tolerance of castings may be inspected piece by piece in accordance with the requirements of 4.6 or by random inspection according to the quantity agreed by both parties. 6.8 Rounding off of test results
The test results of mechanical properties and chemical composition may be rounded off according to the principles of the test methods specified in the standard, but the dimensional measurement results shall not be rounded off.
6.9 Supplementary requirements for inspection
6.9.1 Supplementary requirements for inspection agreed by both the supplier and the purchaser. 32
6.9.2 Supplementary requirements The inspection contents include:
a) metallographic inspection;
b) mechanical property inspection;
c) hardness inspection;
d) bending inspection;
GB/T5680—1998
e) non-destructive testing (penetrant testing, radiographic inspection); f) residual element analysis;
g) quality determination, etc.
The test methods and qualified acceptance levels of the above items are shown in Appendix A. 7 Marking, packaging, transportation, storage
7.1 Marking and certificate
7.1.1 Each casting surface shall be marked with the following marks or part of them. For example: a) factory mark;
b) batch number;
c) other marks required by the purchaser.
When it is not possible to mark the casting, the mark can be printed on the label attached to each batch of castings. 7.1.2 The factory castings shall be accompanied by an inspection certificate, which shall include: a) the name of the supplier;
b) the name of the casting;
c) the casting drawing number or the order contract number;
d) the manufacturing date (or number) or the production batch number. 2 Surface protection, packaging, transportation and storage
Castings shall be protected or packaged after passing the inspection. The surface protection, transportation and storage of castings shall comply with the order agreement. 33
GB/T 5680—1998
Appendix A
(Appendix to the standard)
Supplementary requirements
When using this standard for inquiry, ordering or formulating technical conditions, one or more of the following supplementary requirements may be specified, and the unspecified terms shall not be used as the basis for acceptance.
A1 Inquiries and orders shall be made in accordance with the provisions of Appendix B in GB11352-89. A2 Quality and quality tolerance
The nominal quality of castings shall be determined in accordance with the provisions of GB/T11351. The quality tolerance shall comply with the MT13 grade provisions of GB11351-89. A3 Metallographic structure inspection
The microstructure of the sample after water toughening treatment shall be austenite or austenite plus carbide. A3.1 Carbides shall be evaluated in three levels: undissolved, precipitated and overheated according to the provisions of GB/T13925. A3.1.1 Undissolved carbide level is not greater than W3 level to be qualified. A3.1.2 Precipitated carbide level is not greater than X3 level to be qualified. A3.1.3 Overheated carbide level is not greater than G2 level to be qualified. A3.1.4 If the carbides on the test specimen exceed the requirements of A3.1.1, A3.1.2 and A3.1.3, samples can be taken from the casting for re-inspection, or samples can be taken from the re-water-toughened test block for re-inspection. If the overheated carbides exceed the requirements, the casting shall be scrapped. If the undissolved and precipitated carbides exceed the requirements, they can be treated according to A6.
A3.2 If the purchaser believes that the requirements of A3.1.1, A3.1.2 and A3.1.3 cannot meet its requirements, the acceptance level can be determined by negotiation between the two parties when placing an order.
A3.3 Non-metallic inclusions shall be rated according to the provisions of GB/T13925, and those not exceeding 4A and 4B shall be qualified. A3.4 Samples for metallographic inspection can be prepared from test blocks for mechanical properties. The preparation of metallographic samples shall be no less than 6mm from the casting surface. The test method shall be carried out in accordance with the provisions of GB/T13925.
A4 Mechanical properties test
A4.1 Mechanical properties and test rules
A4.1.1 For mechanical properties test, take one water-toughened specimen from each batch, and the test results shall comply with the provisions of Table A1. If the performance values specified in Table A1 cannot meet the requirements of the purchaser, the acceptance values can be determined by negotiation between the two parties when placing an order. Table A1
Mechanical properties
ZGMn13-1
ZGMn13-2
ZGMn13-3bzxZ.net
ZGMn13-4
ZGMn13-5
≥390
≥635
≥685
≥735
≥735
≥147
A4. 1.2 When the impact performance test is required, three impact specimens are taken from each batch for testing. The average value of the three specimens shall comply with the provisions of Table A1 or the order agreement. The value of one of the specimens may be lower than the specified value, but shall not be lower than one-third of the specified value. 3.1
GB/T5680—1998
A4.1.3 When hardness is used as an acceptance condition, the hardness value negotiated by both parties may be specified in the order agreement as the basis for acceptance. A4.1.4 Test results that do not meet the requirements due to the following reasons are invalid. a) Improper specimen installation or malfunction of the testing machine; b) The tensile specimen breaks outside the gauge length;
c) Improper specimen processing;
d) Casting defects exist in the specimen
At this time, re-inspection should be carried out according to A4.
A4.2 Test Blocks and Test Methods
A4.2.1 Test Blocks
A4.2.1.1 Test blocks for mechanical properties shall be cast separately during pouring. A4.2.1.2 The type of test block shall be determined by the supplier. The shape and size of single-cast test blocks shall comply with the requirements of Figure A1 or Figure A2. A4.2.1.3 Unless otherwise specified, single-cast test blocks and the castings they represent shall be treated with water toughening using the same process. A4.2.2 Tensile Test
Tensile test shall be carried out in accordance with the provisions of GB228.
A4.2.3 Impact Test
Impact Test shall be carried out in accordance with the provisions of GB229.
A4.2.4 Brinell Hardness Test
Brinell Hardness Test shall be carried out in accordance with the provisions of GB231. A4.3 Retest
When the mechanical properties test results do not meet the requirements, and it is not caused by A4.1.3, the supplier can retest. A4.3.1 Take two spare tensile specimens from the same batch for testing. If both test results meet the requirements of Table A1, the tensile properties of the batch are still qualified. If one specimen still fails in the retest, the supplier can handle it according to A6. A4.3.2 Take three spare impact specimens from the same batch for testing, add the results to the original results and recalculate the average value. If the new average value meets the requirements of the contract, the impact energy of the batch of castings is still qualified, otherwise the supplier can handle it according to A6. A5 Bend Test
A5.1 The bend specimen (block) and the casting it represents are cast in a separate mold with molten steel from the same furnace. Its cross-sectional dimensions are 13mm×19mm (1/2inx3/4in) and its length is 300mm (12in). In addition, except for the need to clean the surface unevenness or decarburized layer, the specimen is not processed or ground before water toughening and testing. A5.2 The specimen (block) should be able to be cold-bent 150° in the direction of the 13mm thickness of the cross section without breaking into two pieces to be qualified [If there is a crack on the surface of the specimen (block) after bending, it still remains in one piece, which is also considered qualified]. When a bend test is specified, such a test should be carried out once for each heat of steel.
A5.3 The bending test specimens (blocks) shall be water-toughened in the same manner as the castings they represent. The differences in metal sections shall also be taken into account. Unless otherwise specified by the purchaser, the heat treatment method of the test specimens (blocks) is generally selected by the manufacturer. It can be heat treated alone or together with the castings it represents.
A5.4 If the test specimen (block) fails the test due to defects, the test shall be deemed invalid and another test specimen (block) from the same furnace shall be tested. If the bending test results of a furnace of steel are all unqualified, the manufacturer may prepare supplementary test specimens (blocks) from the same furnace and process them according to A6. At this time, two bending test specimens (blocks) are taken from each furnace.
A5.5 Except for A5.1, A5.2, A5.3, and A5.4, the bending test method shall be carried out in accordance with GB232. A6 Re-water toughening
When the re-test results of mechanical properties, metallographic examination or bending test still do not meet the requirements, another test block representing the batch of castings can be made to re-water toughen and then re-tested, but the number of re-water toughening without the consent of the purchaser shall not exceed two times. 35
A7 Non-destructive testing
A7.1 Penetrant testing
GB/T5680-1998
When using penetrant testing to detect surface defects of castings, the surface to be inspected and the quality level to be accepted shall be agreed upon by the supplier and the purchaser, and the inspection method and rating standard shall be implemented in accordance with the provisions of GB9443. A7.2 Radiographic inspection
When using X-ray or ray to inspect internal defects of castings, the scope to be inspected and the quality level to be accepted shall be agreed upon by the supplier and the purchaser. The inspection method and rating standard shall be implemented in accordance with the provisions of GB5677. A8 Chemical analysis of residual elements
When residual elements need to be specified, the supplier and buyer shall jointly agree on the number, content and total amount of residual elements. A9 Inspection documents
A9.1 The supplier may select the inspection term definitions and document categories in accordance with the provisions of Appendix A of GB11352-89. A9.2 Inspection documents shall be submitted within seven working days after the delivery of the castings. 155
Appendix B
(Standard Appendix)
Dimensional tolerances of castings
B1When there is no provision for the dimensional tolerances of castings in the drawings or ordering agreements, the dimensional tolerances shall comply with the CT13 grade provisions of GB6414-86.
B2Since high manganese steel castings are difficult to process, they are often used directly as rough castings. The shape and assembly dimensional tolerances are listed in Table B1, Table B2, Table B3, and Table B4 for reference and selection by manufacturers during production. Hole diameter and size
Tolerance value
Assembly size hole distance
Tolerance value
Basic size of castings
Tolerance value
Basic size of castings
Tolerance value
GB/T5680—1998
Table B1
Dimension tolerance of cast holes and grooves
>25～40
Dimension tolerance of assembly hole distance
>160～250
≥250~400
>40～63
>400-~630
Straightness and flatness tolerance
>250400
>400~630
≥400~630
Roundness tolerance
>630～1000
>630～1600
>63～100
≥630~1 000
≥1000~1 600
>1 000~1 600≥1 600~2 500
>1 000~1 600
≥1 600~2 5002 Inspection documents shall be submitted within seven working days after delivery of castings. 155
Appendix B
(Standard Appendix)
Dimensional tolerances of castings
B1 Where there is no stipulation on the dimensional tolerances of castings in drawings or ordering agreements, the dimensional tolerances shall comply with the CT13 grade stipulations of GB6414-86.
B2 As high manganese steel castings are difficult to process, they are often used directly as rough castings. Their shape and assembly dimensional tolerances are listed in Table B1, Table B2, Table B3, and Table B4 for reference and selection by manufacturers during production. Hole diameter and size
Tolerance value
Assembly size hole distance
Tolerance value
Basic size of castings
Tolerance value
Basic size of castings
Tolerance value
GB/T5680—1998
Table B1
Dimension tolerance of cast holes and grooves
>25～40
Dimension tolerance of assembly hole distance
>160～250
≥250~400
>40～63
>400-~630
Straightness and flatness tolerance
>250400
>400~630
≥400~630
Roundness tolerance
>630～1000
>630～1600
>63～100
≥630~1 000
≥1000~1 600
>1 000~1 600≥1 600~2 500
>1 000~1 600
≥1 600~2 5002 Inspection documents shall be submitted within seven working days after delivery of castings. 155
Appendix B
(Standard Appendix)
Dimensional tolerances of castings
B1 Where there is no stipulation on the dimensional tolerances of castings in drawings or ordering agreements, the dimensional tolerances shall comply with the CT13 grade stipulations of GB6414-86.
B2 As high manganese steel castings are difficult to process, they are often used directly as rough castings. Their shape and assembly dimensional tolerances are listed in Table B1, Table B2, Table B3, and Table B4 for reference and selection by manufacturers during production. Hole diameter and size
Tolerance value
Assembly size hole distance
Tolerance value
Basic size of castings
Tolerance value
Basic size of castings
Tolerance value
GB/T5680—1998
Table B1
Dimension tolerance of cast holes and grooves
>25～40
Dimension tolerance of assembly hole distance
>160～250
≥250~400
>40～63
>400-~630
Straightness and flatness tolerance
>250400
>400~630
≥400~630
Roundness tolerance
>630～1000
>630～1600
>63～100
≥630~1 000
≥1000~1 600
>1 000~1 600≥1 600~2 500
>1 000~1 600
≥1 600~2 500
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