ASTM A451 Standard Specification

A451 / A451M – 06(2010) Standard Specification for Centrifugally Cast Austenitic Steel Pipe for High-Temperature Service

Standard covers the standard for centrifugally cast austenitic alloy steel pipe for use in high-temperature, corrosive, or nuclear pressure service. The pipe shall receive a heat treatment at the required temperature and holding time followed by quenching in water or rapid cool by other means. The pipe shall be machined on the inner and outer surfaces and shall conform to specified roughness value. Heat and product analysis shall be done to determine the chemical composition and shall conform to the required carbon, manganese, phosphorus, sulfur, silicon, nickel, chromium, molybdenum, columbium, tantalum, and nitrogen contents. Hydrostatic and tension tests shall be performed and shall conform to the required tensile strength, yield strength, and elongation.

This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

Scope

1.1 This specification covers austenitic alloy steel pipe for use in high-temperature, corrosive, or nuclear pressure service.
1.2 Several grades of austenitic stainless steel are covered as indicated in Table 1.
1.3 Optional supplementary requirements are provided when additional testing may be required.

Grades and chemical composition

Grade C(max) Mn(max) P(max) S(max) Si(max)
CPF3 0.03 1.5 0.04 0.04 2
CPF3A 0.03 1.5 0.04 0.04 2
CPF8 0.08 1.5 0.04 0.04 2
CPF8A 0.08 1.5 0.04 0.04 2
CPF3M 0.08 1.5 0.04 0.04 1.5
CPF8M 0.08 1.5 0.04 0.04 1.5
CPF10MC 0.08 1.5 0.04 0.04 1.5
CPF8C 0.08 1.5 0.04 0.04 2
CPF8C (Ta max) 0.08 1.5 0.04 0.04 2
CPH8 0.08 1.5 0.04 0.04 1.5
CPH20/CPH10 0.2 1.5 0.04 0.04 2
CPK20 0.2 1.5 0.04 0.04 1.75
CPE20N 0.2 1.5 0.04 0.04 1.5
Grade Ni Cr Mo Nb Ta N
CPF3 8~12 17~21 —— —— —— ——
CPF3A 8~12 17~21 —— —— —— ——
CPF8 8~11 18~21 —— —— —— ——
CPF8A 8~11 18~21 —— —— —— ——
CPF3M 9~13 17~21 2~3 —— —— ——
CPF8M 9~12 18~21 2~3 —— —— ——
CPF10MC 13~16 15~18 1.75~2.25 ≤1.2  ≥10×C —— ——
CPF8C 9~12 18~21 —— ≤1  ≥8×C —— ——
CPF8C Ta max 9~12 18~21 —— ≤1  ≥8×C 0.1 ——
CPH8 12~15 22~26 —— —— —— ——
CPH20/CPH10 12~15 22~26
CPK20 19~22 23~27 —— —— —— ——
CPE20N 8~11 23~26 —— —— —— 0.08~0.2

1) the grades CPF10MC and CPF8C (Nb + Ta) may contain not more than 1.35%.
2) non-standard grades ASTM or cast steel associations have not yet registered.
3) a consultation between the the grades CPH20 carbon content can not more than 0.1%. If this is agreed, the grades should CPH10.

The mechanical properties of the steel pipe

Grade
Tensile strength (Mpa, min) Yield strength (Mpa, min) Elongation (%, min)
CPF3 485 205 35
CPF3A 1) 535 240 35
CPF3M 485 205 30
CPF8 485 205 35
CPF8A 1) 535 240 35
CPF8M 485 205 30
CPF10MC 485 205 20
CPF10 485 205 30
CPF8C(Ta max),CPF8C 485 205 30
CPH8 448 195 30
CPK20 448 195 30
CPH20 485 205 30
CPE20N 550 275 30

This performance is Table 1 listed ingredients within the adjusted component, to ferrite – austenitic proportion, to achieve the required high tensile strength and yield strength. When this material on the use temperature above 800 ℃, may result in a low impact value.

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