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General Terms

ASTM standards cover the following categories of alloy steel alloys, which have direct analogues in domestic standards:

Classes

In addition, the ASTM standards also contain general guidelines for methods of melting iron-chromium-nickel alloys used in high-temperature assemblies and joints. The standard includes classes HF, HH, HI, HK, HK, HE, HT, HU, HW, HX, HC, HD, HL, HN and HN, which require that all heat and relaxation resistant steels be produced in electric arc or induction furnaces. Heat treatment may be performed as agreed between the manufacturer and the customer.

Testing

The material of these steels must meet the percentages of carbon, manganese, silicon, phosphorus, sulfur, chromium, nickel and molybdenum. Requirements are also established which relate to a list of test items. These include tests for

1. Long-term strength (creep) at temperatures up to 600...700°C;
2. fluidity (technological plasticity);
3. relative elongation at tensile strain;
4. weldability, including the production of repairs.

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Group content

The ASTM standards address the melting of chromium-nickel heat-resistant steels for general purposes, and no attempt has been made to include heat-resistant alloys used for special applications. Specifications A351 / A351M, A217 / A217M and A447 / A447M apply to such steels. The main ASTM standards are:

A217 / A217M for steel castings, martensitic stainless and alloyed steel alloys that are designed for parts and assemblies operating under pressure and at high temperatures;

A351 / A351M for austenitic steels for the same purpose;

A370, relating to test methods for mechanical testing of steel products;

A447 / A447M - for heat-resistant steels containing chromium, nickel and iron.

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