ASTM A352 Standard Specification for Steel Castings, Ferritic, and Martensitic, for Pressure Containing Parts, Suitable for Low Temperature Service

Get Certified ASTM A352 for Reliable Low-Temperature Steel Castings

Foundries lean on ASTM A352 to confirm that ferritic and martensitic steel castings hold up to the sub-zero conditions a valve, flange, or fitting faces in cryogenic or LNG service. Testing that stays consistent from heat to heat keeps grade certification meaningful and cuts the odds of brittle fracture once a casting reaches its rated low temperature. Matestlab brings calibrated tensile, chemical, and Charpy impact testing to the process, backed by analysts who know how to verify low-temperature castings against ASTM A352.

The scope of ASTM A352 includes:

• Material type: Ferritic steel castings across eight grades and one martensitic grade, CA6NM.
• Purpose: Establishment of chemical, mechanical, and impact toughness requirements for pressure-containing castings in low-temperature service.
• Property evaluation: Tensile strength, yield strength, elongation, and Charpy impact energy at the grade’s minimum testing temperature.
• Testing method: A tensile test verifies mechanical properties, and a Charpy impact test confirms toughness at the specified low temperature.
• Results: Compliance determination against the chemical and mechanical limits stated for the ordered grade.
• Test limitation: Hardenability limits the maximum section size at which some ferritic grades reach the required mechanical properties.
• Use conditions: Foundries heat-treat each casting to match its design and chemical composition, and heavier ferritic sections normally need liquid quenching.
• Application: Supports valves, flanges, fittings, and other pressure-containing parts in cryogenic, LNG, and other low-temperature systems.

What are the Uses of ASTM A352 Testing?

The purpose of ASTM A352 testing for foundries is twofold: to help ensure that ferritic and martensitic steel castings meet the toughness requirements of low-temperature pressure systems and to assist engineers in choosing the correct grade based on the lowest temperatures a valve, flange, or fitting face will see during service. This standard-

• Confirms tensile strength, yield strength, and elongation for the ordered grade.
• Verifies Charpy impact toughness at the grade’s minimum testing temperature.
• Supports quality control across casting production heats.
• Assists engineers in selecting a grade suited to cryogenic or LNG service.
• Compares castings from different foundries against the same low-temperature requirements.
• Flags grades unsuited to a project’s coldest design temperature before installation.

Which materials can be tested under ASTM A352?

ASTM A352 is used for steel castings of eight grades of ferritic steel and the martensitic grade CA6NM used for valves, flanges, fittings and other pressure-containing parts. Some austenitic castings to Specification A351/A351M are also suitable after impact testing by the purchaser and manufacturer under conditions agreed upon. Castings not suitable for the chemical or heat-treatment requirements of a given grade are not within the low-temperature coverage of this specification.

Why is ASTM A352 Important?

Grade selection determines whether a ferritic or martensitic casting resists brittle fracture at the coldest temperature a cryogenic or LNG system reaches. A casting pushed below its grade’s rated minimum testing temperature, Grade LCA below −25 °F (−32 °C), for instance, risks losing the toughness a pressure-containing part needs under sudden load. Reliable testing under ASTM A352 keeps low-temperature casting quality consistent across foundries and backs up safe performance in cryogenic and LNG piping systems.

ASTM A352 Testing Process and Data Collection

A technician selects a representative casting or test coupon from the production heat and confirms the ordered grade. The casting goes through heat treatment matched to its design, then a technician machines a tension specimen and Charpy impact specimens for testing. The tension specimen determines tensile strength, yield strength, and elongation, while Charpy specimens undergo impact testing at the grade’s minimum testing temperature. A foundry compiles the chemical, mechanical, and impact data into the casting’s compliance record.

Common Challenges and Troubleshooting

Insufficient quenching on heavier ferritic sections ranks high among issues in low-temperature castings, since inadequate quenching leaves mechanical properties short of the ordered grade’s requirements. Testing a casting at the wrong temperature causes its own trouble, since Charpy results depend heavily on matching the grade’s specified minimum testing temperature exactly. Foundries avoid these problems by controlling quench rate and medium for heavier sections, verifying test-temperature equipment before Charpy testing, and running chemical analysis before mechanical testing begins.

• Analysts report tensile strength and yield strength in ksi or MPa against the minimum the ordered grade sets.
• Technicians measure elongation as a percentage over a standard gage length and compare it against the ordered grade’s minimum.
• Engineers confirm Charpy impact energy at the grade’s minimum testing temperature, such as −320 °F (−196 °C) for Grade LC9 or −25 °F (−32 °C) for Grade LCA.
• Analysts document chemical composition results for elements such as carbon, manganese, and nickel against the ordered grade’s limits.
• A foundry references both ASTM A352 and the ordered grade on the compliance record.

Link to ASTM A352