Stainless for cryogenic service: LNG and low-temperature applications

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cryogenic · LNG · 304L · 316L · impact toughness

For cryogenic service below −100°C, austenitic 304L/316L is preferred; avoid ferritic and martensitic grades. Low-temperature toughness, welding and impact testing are critical.

LNG, air separation and cryogenic equipment demand high low-temperature toughness:

1) Grade: austenitic 304L/316L retain good toughness at cryogenic temperatures (−162°C LNG, −196°C liquid nitrogen) and are the usual choice. Ferritic and martensitic grades are prone to brittle fracture at low temperature and are unsuitable.
2) Impact testing: perform low-temperature Charpy impact tests (e.g. −196°C) per the standard to confirm toughness.
3) Welding: control heat input and interpass temperature, use matching consumables (e.g. 308L/316L), inspect per code.
4) Design: avoid stress concentration and cold-brittle configurations.
5) Applications: LNG tank inner shells, cryogenic piping, air separation equipment.

Purchasing reminder: require low-temperature impact reports, material certificates and welding procedure qualification; protect against mechanical damage during transport and installation.

Note: "stainless" does not automatically mean "suitable for low temperature" — check the grade and impact data.

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。

Stainless for cryogenic service: LNG and low-temperature applications

For cryogenic service below −100°C, austenitic 304L/316L is preferred; avoid ferritic and martensitic grades. Low-temperature toughness, welding and impact testing are critical.

LNG, air separation and cryogenic equipment demand high low-temperature toughness:

1) Grade: austenitic 304L/316L retain good toughness at cryogenic temperatures (−162°C LNG, −196°C liquid nitrogen) and are the usual choice. Ferritic and martensitic grades are prone to brittle fracture at low temperature and are unsuitable.
2) Impact testing: perform low-temperature Charpy impact tests (e.g. −196°C) per the standard to confirm toughness.
3) Welding: control heat input and interpass temperature, use matching consumables (e.g. 308L/316L), inspect per code.
4) Design: avoid stress concentration and cold-brittle configurations.
5) Applications: LNG tank inner shells, cryogenic piping, air separation equipment.

Purchasing reminder: require low-temperature impact reports, material certificates and welding procedure qualification; protect against mechanical damage during transport and installation.

Note: "stainless" does not automatically mean "suitable for low temperature" — check the grade and impact data.

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。