Reading ASTM A240: chemistry, mechanicals, dimensions and tests

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ASTM A240 · standard clauses · inspection · purchasing

A240 is the most common US standard for stainless plate and sheet. At purchasing and acceptance, focus on the chemistry table, guaranteed mechanicals, referenced dimensional standard (A480) and test requirements.

ASTM A240 is the core US standard for chromium-nickel stainless plate and sheet. Reading the key clauses reduces acceptance disputes:

1) Scope: hot-rolled and cold-rolled stainless plate, sheet and strip, covering grades such as 304/304L/316L/321/2205.
2) Chemistry: each grade has ranges for C, Mn, P, S, Si, Cr, Ni, Mo and N. Distinguish the specified range from permitted product-analysis tolerances — retests are judged against the tolerances.
3) Mechanicals: tensile strength, yield strength, elongation and, for some grades, maximum hardness; cold-worked tempers have separate requirements.
4) Dimensions and flatness: A240 does not specify detailed dimensional tolerances; it references A480 (general requirements) or another dimensional standard. State the dimensional standard in the contract.
5) Tests and retests: tensile specimen orientation, test methods, retest rules; add intergranular corrosion or NDT requirements when needed.
6) Certification: require EN 10204 3.1 or as agreed; the certificate must list heat numbers and measured values.

Purchasing advice: order with a clear description such as "grade 316L, ASTM A240 + A480, 2B finish", and agree thickness tolerance class and surface acceptance criteria.

本文由 SteelWe 编辑与行业专家整理，内容仅供行业交流参考，不构成交易或投资建议。引用请注明来源。

Reading ASTM A240: chemistry, mechanicals, dimensions and tests

ASTM A240 is the core US standard for chromium-nickel stainless plate and sheet. Reading the key clauses reduces acceptance disputes:

1) Scope: hot-rolled and cold-rolled stainless plate, sheet and strip, covering grades such as 304/304L/316L/321/2205.
2) Chemistry: each grade has ranges for C, Mn, P, S, Si, Cr, Ni, Mo and N. Distinguish the specified range from permitted product-analysis tolerances — retests are judged against the tolerances.
3) Mechanicals: tensile strength, yield strength, elongation and, for some grades, maximum hardness; cold-worked tempers have separate requirements.
4) Dimensions and flatness: A240 does not specify detailed dimensional tolerances; it references A480 (general requirements) or another dimensional standard. State the dimensional standard in the contract.
5) Tests and retests: tensile specimen orientation, test methods, retest rules; add intergranular corrosion or NDT requirements when needed.
6) Certification: require EN 10204 3.1 or as agreed; the certificate must list heat numbers and measured values.

Purchasing advice: order with a clear description such as "grade 316L, ASTM A240 + A480, 2B finish", and agree thickness tolerance class and surface acceptance criteria.

本文由 SteelWe 编辑与行业专家整理，内容仅供行业交流参考，不构成交易或投资建议。引用请注明来源。