This standard specifies the technical requirements, test methods and acceptance rules for cast anchor chain steel. This standard applies to the production and acceptance of cast steel and its accessories. Its chemical composition is also applicable to the acceptance of steel used in the production of steel ingots and their products. GB/T 552-1996 Cast anchor chain steel GB/T552-1996 Standard download decompression password: www.bzxz.net

1CS 47. 020. 05
National Standard of the People's Republic of China
GR/T552—1996
Anchor chain casting steel
Issued on 1996-01-25
Implemented on 1996-10-01
National Technical Week
National Standard of the People's Republic of China
Casting anchor chain steel
Anchar chain rasting steel
1 Subject content and scope of application
This standard specifies the technical requirements for steel for chain rasting, and the test and acceptance rules for steel. GB/T552-1996
Replaces CB552--84
C 11629-39
This standard is applicable to the production and acceptance of steel for natural steel and its accessories. The chemical composition is also suitable for the production of copper chains and their products for acceptance. 2 Reference standard chemical analysis sampling method and product analysis allowed by the new method of chemical analysis of iron and metal tensile test method Cast chain anchor chain double swivel ring GH 4159 GH$397 3 Technical requirements 3.1 Medicine
Jinzhan low summer specific impulse test method
General engineering raw carbon idle
Relative toilet tension test cold sample
Rao made anchor chain can be divided into two categories: secondary made anchor silicon steel: tensile strength lower limit greater than 490N/Tm: blue grade steel · controlled bending lower limit "SHrN/rm3-2" brand composition
Labor chain Zhao brand self-casting code , primary school storage chain code machine code market sales Chu payment other network release Bo teaching characters. Example,
chain level:
chain code
--tensile strength, N/mm
casting code
national technical supervision bureau 1996-01-25 approved makeup 1996-10-01 implementation
3.3 brand and chemical composition of the hub
GB/T 552-1996
The steel grade and chemical composition shall comply with the provisions of Table 1 Table 1
Chemical composition, %
24*455M1.2
7G590M:.2
3.4 ​​Melting method
Casting pins shall be roasted in two-phase electric furnace or induction furnace. 3.5 Transformation
3.5.1 The chain anchor chain and its products made of chain steel shall be delivered in the quality state, Ni
3.5.2 The delivery state of the anchor chain and its products made of cast steel shall be determined by negotiation between the supplier and the buyer. 3.6 Mechanical properties
The mechanical properties of copper shall comply with the provisions of Table 2
Tensile strength carbon electric
2G40SMI.2bzxz.net
3.7 Heat treatment
Fa hye
The cast iron bottom of the grade 3 steel shall be subjected to quality treatment
3-7.2 The grade 3 steel shall be subjected to normalizing quality treatment. 3.7.3 Heat treatment shall be determined by the manufacturer. 4 Test methods
4.1 Chemical analysis test
4.1.7 The chemical analysis sample shall be taken from the steel sheet or the middle of the steel sheet. 4.1.2 The chemical analysis sample method shall be in accordance with GB222. 4.7.3 The chemical analysis method shall be in accordance with GB223. 4.2 Mechanical properties test
4.2.1 Test block
Meibi fast impact
Test wide range ℃
4.2.1.1 Mechanical properties test block, the test block type is determined by the manufacturer, 4.2.1.2 The shape, size and preparation position of the single steel block shall be in accordance with GB5676. 4.2.1.3 The single cast test block shall be the same as the chain it represents. 4.2.2 Tensile test
4.2.2.1 Each product of the melting furnace shall be subjected to a tensile test. 4.2.2.2 The tensile test method shall be in accordance with GB22. 4.2.3 Impact test
Newly received
GB/T552-1996
The V-notch impact test shall be carried out on the newly received steel bars. The test method shall be in accordance with GB15. The impact test specimen shall be composed of a group of three test pieces. The test value shall be the average of three test pieces. The average value shall meet the requirements of GB2. 5 Inspection regulations
5.1 The steel bars made of injection molding and their products, steel and other products shall be inspected and accepted by the technical supervision department. 5.2 Test items, sampling method, and test method shall conform to the requirements of Table 3, GB 6357, GB 6357, GB 4159, GB 6357 sampling method, GB 4159 sampling method, GB 6357 sampling method, GB 4159 sampling method, GB 6357 sampling method, GB 4159 sampling method, GB 6357 sampling method, GB 4159 sampling method, GB 6357 sampling method, GB 4159 sampling method, GB 6357 sampling method, GB 4159 sampling method, GB 6357 sampling method, GB 4159 sampling method, GB 6357 sampling method, GB 6357 sampling method, GB 4159 sampling method, GB 6357 sampling method, GB 6357 sampling method, GB 6357 sampling method, GB 6357 sampling method, GB 6357 sampling method, GB 6357 sampling method, GB 6357 sampling method, GB 6357 sampling method, GB 6357 sampling method, GB 6357 sampling method Under the condition of mechanical inspection, the content of residual elements specified is allowed to be analyzed without analysis. 5.4 Mechanical inspection
5.4.1 Tensile test
5.4.1.1 Tensile test results meet the requirements of Table 2. 5.4.1.2 When the tensile test results do not meet the requirements of Table 2, double test should be selected for retest. When the two test results of the retest are all qualified, the seat will be accepted. Inspection method
GR=159
When there is a small difference in the two test results of the summer test, the product of the liquid smelting furnace mother should be replaced or reheated (including domestic fire treatment or tempering treatment).
The quenching and tempering treatment must be repeated three times (including the first quenching and tempering heat treatment)). 5.4.2 Impact test
5.4.2.: The impact test results shall comply with the provisions of Table 2.5.4.2.2 When two of the three impact test results are lower than the values ​​specified in Table 3 (one of them is lower than 70% of the specified value), another group of three samples are allowed to be taken for additional test.
a. When the test value of one sample in the additional test is added to the three test values ​​of the original test, the average value of the six values ​​is not lower than the value specified in Table 3, it is considered qualified.
6. Among the six values, no more than two values ​​are lower than the values ​​in Table 2, and the lower one is equal.
If the test results still do not comply with the provisions of Table 2, the product of the product number is allowed to be re-tempered, but the tempering shall not be repeated more than once (including the first time):
Supplementary content,
This standard is proposed by China Shipbuilding Industry Corporation. GB/E552-1996
This standard is under the jurisdiction of Luoyang Material Research Institute of China State Shipbuilding Corporation. This standard was drafted by Dalian Shipyard. The main authors of this standard are Chen Laixiang,
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