ASME SA553 Type 1 9% Nickel Steel Sheet with Low-Temperature Toughness for Cryogenic Pressure Vessels
ASTM A553 Type 1 is a high-nickel alloy steel plate specification issued by ASTM International (formerly the American Society for Testing and Materials). The material is colloquially called "9% nickel steel" because its nickel content ranges from 8.50% to 9.50% by weight.
The steel combines high tensile strength (690-825 MPa) with exceptional low-temperature toughness, making it one of the most widely specified materials for cryogenic pressure vessels operating at temperatures down to −196 °C (−320 °F).
- Decades of proven service: ASTM A553 Type I has been used reliably for LNG and cryogenic containment since the 1960s
- Martensitic microstructure with high toughness: Unlike conventional martensitic steels, A553 remains ductile rather than brittle at cryogenic temperatures
- Good weldability: Designed for welded pressure vessel fabrication, compatible with nickel-based welding consumables
- Availability across supply chains: As an ASTM standard, mills and distributors worldwide recognize and stock A553 Type 1 plates
Your selection path can ultimately be summarized as: Choose ASTM A553 Type 1 when your project does not need ASME Code stamping but still demands full cryogenic performance - the material is identical to SA553.
ASME SA553 Type 1 is the same 9% nickel alloy steel - identical in chemical composition, mechanical properties, and heat treatment requirements to ASTM A553 Type 1. The key difference is the standard-issuing body: ASME (the American Society of Mechanical Engineers) adopts ASTM material specifications into its Boiler & Pressure Vessel Code (BPVC) by adding an "S" prefix.
- The ASME SA-553 specification is published in ASME BPVC Section II, Part A, which governs ferrous material specifications for pressure vessel construction
- When a pressure vessel is designed, fabricated, inspected, and stamped in accordance with ASME BPVC Section VIII, the materials used must (in most jurisdictions) carry ASME designations
- That's the single biggest reason a buyer might need "SA553" rather than "A553" plates: regulatory compliance, not any metallurgical difference
| Claim | Reality |
|---|---|
| "SA553 is a higher grade." | False. The chemical and mechanical requirements are identical. |
| "ASTM A553 is less strict." | False. Both require the same impact testing at −196 °C and the same Q&T heat treatment. |
| "You must use SA553 for any pressure vessel." | Depends on jurisdiction. Many countries accept ASTM material certifications for non-code-stamped vessels. |
| "ASME material costs more." | Partially true. ASME traceability and documentation add cost, but the steel itself is the same. |
| Element | ASTM A553 Type 1 (Weight %) | ASME SA553 Type 1 (Weight %) |
|---|---|---|
| Carbon (C) | ≤ 0.13 | ≤ 0.13 |
| Manganese (Mn) | ≤ 0.90 | ≤ 0.90 |
| Phosphorus (P) | ≤ 0.035 | ≤ 0.035 |
| Sulfur (S) | ≤ 0.04 | ≤ 0.04 |
| Silicon (Si) | 0.15-0.30 | 0.15-0.30 |
| Nickel (Ni) | 8.50-9.50 | 8.50-9.50 |
| Iron (Fe) | Balance | Balance |
| Test | Requirement (Both Specs) |
|---|---|
| Tensile Strength, Ultimate | 690-825 MPa (100-120 ksi) |
| Tensile Strength, Yield (0.2% offset) | ≥ 585 MPa (84.8 ksi) |
| Elongation in 50 mm (2 in) | ≥ 20% |
| Charpy V-Notch (transverse, −196 °C) | ≥ 27 J |
| Lateral Expansion (−196 °C) | ≥ 0.381 mm |
Choose ASTM A553 Type 1 If:
- Your project only requires ASTM material compliance
- Pressure vessel code certification is not mandatory
- General cryogenic engineering applications are involved
Choose ASME SA553 Type 1 If:
- Your project falls under ASME BPVC regulations
- Pressure vessel certification is required
- International EPC standards must be followed
- LNG terminal projects require code compliance
- Send your specification (grade, dimensions, quantity, delivery terms) to info@gneesteels.com for a same-day price
- Ask about our dual-certified ASTM A553 / ASME SA553 Type 1 plates with immediate stock availability
- Request a free material consultation if you're comparing 9% nickel steel cost vs. alternatives like ASTM A645 (5%-6% Ni steel)
Don't let a material certification mismatch delay your vessel fabrication schedule. Contact GNEE Steel today - we make ASTM A553 Type 1 & ASME SA553 Type 1 procurement simple, reliable, and cost-efficient.
Yes. The chemical composition, mechanical properties, heat treatment (quenched & tempered), and impact testing requirements are identical. The difference is the publishing body: ASTM vs. ASME.
ASTM A553 Type 1 covers 9% nickel alloy steel plates that are used in the fabrication of cryogenic pressure vessels. This material is capable of operating at temperatures as low as -196°C, and has high levels of strength and weldability.
Yes. ASME-certified plates typically carry a 5-15% premium over ASTM-only plates due to additional documentation, auditing, and traceability requirements - even though the steel is metallurgically identical. For budget-sensitive projects that do not require ASME stamping, ASTM A553 Type 1 is the cost-effective choice.
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