ASTM A351: Austenitic Steel Casting Testing Services
Accredited ASTM A351 austenitic steel casting testing from Infinita Lab, performed to the exact standard requirements - accurate, reproducible results with full documentation for compliance, R&D, and quality control programs.
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- Overview
- Scope, Applications, and Benefits
- Test Process
- Specifications
- Instrumentation
- Results and Deliverables
What Is ASTM A351 Austenitic Steel Casting?
ASTM A351 is the standard specification for austenitic and austenitic-ferritic (duplex) stainless steel castings intended for valves, flanges, fittings, and other pressure-containing parts used in corrosive, high-temperature, and cryogenic service. The standard covers a broad family of corrosion-resistant cast grades – including the widely used CF8, CF8M, CF3, and CF3M compositions, along with higher-alloy grades such as CN7M, CE20N, CH8, CH20, and CK20 – and defines the chemical composition, tensile properties, and, for applicable grades, ferrite content and intergranular corrosion resistance that each casting must meet before it enters service.
Conformance testing to ASTM A351 verifies that a casting’s chemistry and mechanical performance match the grade specified on the purchase order. Chemical composition analysis, typically performed by optical emission spectrometry, confirms that alloying elements such as chromium, nickel, molybdenum, and carbon fall within the ranges the standard sets for the ordered grade. Tensile testing on separately cast or integrally cast test coupons establishes tensile strength, yield strength, and elongation against the specification’s minimums. For low-carbon and molybdenum-bearing grades used in aggressive chloride or acidic environments, ferrite content determination and intergranular corrosion resistance testing provide an additional layer of assurance that the casting will resist hot cracking during fabrication and localised attack in service.
This testing matters because A351 castings are used in pressure-containing components – valve bodies, flanged fittings, pump casings, and vessel parts – where an undetected deviation in chemistry, strength, or corrosion resistance can compromise the integrity of a pressurised system. Independent, accredited verification against ASTM A351 gives manufacturers, purchasers, and end users documented, defensible evidence that a casting meets the mechanical and metallurgical requirements of its safety-critical application.
Applications and Benefits of ASTM A351 Austenitic Steel Casting Testing
Scope
- ASTM A351 covers austenitic and austenitic-ferritic (duplex) stainless steel castings supplied for valves, flanges, fittings, and other pressure-containing parts.
- The specification includes common corrosion-resistant grades such as CF8, CF8M, CF3, and CF3M, along with related CF, CH, CK, and CN series compositions used across the pressure equipment industry.
- Testing verifies chemical composition against the grade-specific ranges the standard sets for elements including chromium, nickel, molybdenum, and carbon.
- Tensile testing confirms that tensile strength, yield strength, and elongation meet the minimum values required for the specified grade.
- Ferrite content determination is performed on applicable grades to confirm the casting falls within the range needed to resist hot cracking without compromising toughness or corrosion resistance.
- Intergranular corrosion resistance testing is applied to low-carbon and stabilised grades intended for as-cast or as-welded service in corrosive media.
- Test coupons may be separately cast, cast-on, or taken from production castings, depending on the requirements agreed between purchaser and supplier.
- Manufacturers of valves, pumps, and fittings supplying the petrochemical, refining, power generation, and chemical processing industries widely reference this specification.
- Conformance testing under ASTM A351 supports material certification, quality assurance documentation, and traceability for pressure-retaining castings.
- A351 test results support mill certificates, material test reports, and acceptance decisions before castings are released for installation.
Applications
- Qualification testing for valve body, bonnet, and trim castings used in oil and gas, refining, and chemical processing service.
- Verification of flange and fitting castings supplied for piping systems handling corrosive or high-temperature fluids.
- Incoming material inspection for pump casings, impellers, and other pressure-wetted components in process industries.
- Quality control testing during casting foundry production runs to confirm consistent chemistry and mechanical properties.
- Third-party verification supporting purchase order compliance for power generation and pressure vessel component suppliers.
- Materials qualification for marine, offshore, and desalination equipment exposed to chloride-rich environments.
- Support for engineering re-certification when original mill documentation is incomplete or in question.
Benefits
- Independent confirmation that castings meet the chemical and mechanical requirements of the specified ASTM A351 grade.
- Early detection of composition or property deviations before installing castings in pressure-containing service.
- Documented, accredited test reports that support regulatory, code, and customer compliance requirements.
- Reduced risk of in-service failure from undetected corrosion susceptibility or substandard mechanical properties.
- Faster procurement and acceptance decisions through a single coordinated testing partner.
- Consistent, repeatable results from accredited laboratories using calibrated, standard-compliant test methods.
Our ASTM A351 Testing Procedure
Material Identification
Casting grade and specification are verified according to ASTM A351.
1Mechanical Testing
Tensile and hardness tests are conducted to evaluate strength and ductility.
2Chemical Analysis
Elemental composition is analyzed to confirm compliance with grade requirements.
3Data Recording & Evaluation
Results are compared with ASTM A351 requirements for acceptance.
4ASTM A351 Test Parameters and Requirements
| Parameter | Details |
|---|---|
| Applicable Materials | Austenitic stainless steel castings |
| Tensile Strength | ~485 MPa to 620 MPa |
| Yield Strength | ~205 MPa to 310 MPa |
| Elongation | ≥ 30% |
| Heat Treatment | Solution annealed (~1040°C to 1120°C) |
| Chromium Content | ~16% to 26% |
- Optical Emission Spectrometer (OES) – quantifies chromium, nickel, molybdenum, carbon, and other alloying elements against grade-specific chemical composition limits.
- Universal Testing Machine (UTM) – applies controlled tensile load to determine tensile strength, yield strength, and elongation of test specimens.
- Hardness Tester – measures hardness to support verification of heat-treatment conditions and mechanical property consistency.
- Ferrite Scope / Magnetic Ferrite Meter – measures ferrite content in austenitic and duplex grades where the specification requires a defined ferrite range.
- Corrosion Test Apparatus – supports intergranular corrosion resistance testing for applicable low-carbon and stabilised casting grades.
- Metallographic Preparation Equipment – prepares polished specimens for microstructural evaluation supporting ferrite and corrosion assessments.
- Calibrated Specimen Preparation Tooling – machines tensile and corrosion specimens to the dimensional tolerances required for accurate, repeatable testing.
Equipment and Instrumentation Used for ASTM A351 Testing
What You Receive: Test Report, Data, and Certification
- Accredited test report documenting chemical composition results against ASTM A351 grade requirements.
- Tensile test results, including tensile strength, yield strength, and elongation, compared to specification minimums.
- Ferrite content results and pass/fail determination for grades where ferrite content is specified.
- Intergranular corrosion resistance test results for applicable low-carbon and stabilised grades.
- Clear pass/fail conclusions referencing the specific ASTM A351 grade and any applicable supplementary requirements.
- Traceable documentation suitable for material certification, mill test reports, and regulatory or customer records.
ASTM A351 Austenitic Steel Casting FAQs
ASTM A351 includes chemical composition, mechanical properties, heat treatment, pressure integrity, and casting quality, ensuring austenitic stainless steel castings meet requirements for pressure-containing components in industrial and critical applications.
ASTM A351 covers austenitic stainless steel grades such as CF8, CF8M, and CF3M used in cast form for pressure-containing parts requiring corrosion resistance.
ASTM A351 defines tensile strength, yield strength, elongation, and hardness requirements, ensuring castings meet performance criteria for pressure service.
ASTM A351 castings are used in valves, pumps, pressure vessels, and piping components in chemical, petrochemical, and power industries.
ASTM A351 defines properties under controlled conditions and may not account for casting defects, welding, or service environments influencing long-term performance of pressure-containing components.
ASTM A351 Grade CF8 is an austenitic stainless steel casting grade, commonly used for valves, flanges, fittings, and other pressure-containing components. It is covered under ASTM A351/A351M, which specifies chemical composition and mechanical requirements for austenitic steel castings.
Why Choose Infinita Lab for Austenitic Steel Casting Testing
When your Austenitic Steel Casting results have to hold up - for compliance, a customer audit, or an engineering decision - ASTM A351 accuracy and an unbiased third-party report matter more than price. Infinita Lab routes your ASTM A351 austenitic steel casting testing to ISO/IEC 17025-accredited U.S. partner labs with hands-on method experience, so you get defensible data, transparent reporting, and turnaround times built around your project deadline - not ours.
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