SA553 Type 1 is a quenched and tempered alloy steel plate containing nominally 9% nickel. This steel grade was specifically developed to deliver outstanding fracture toughness, yield strength, and weldability at cryogenic temperatures where standard carbon steels would become dangerously brittle and prone to catastrophic failure.
The ASME SA-553/SA-553M specification covers both Type I (9% nickel) and Type II (8% nickel), but SA553 Type 1 remains the most widely specified grade for the harshest cryogenic service environments due to its superior impact resistance at -196°C.
Unlike conventional low-temperature steels that rely solely on grain refinement for toughness, SA553 Type 1 develops a unique low-carbon martensitic microstructure through precisely controlled quenching and tempering. The resulting material is remarkably tough - not brittle or hard - and can be readily fabricated, welded, and formed into complex pressure vessel geometries even at thicknesses of up to 50 mm or more.
It is important to note that SA553 Type 1 is sometimes written in search terms as SA553 Type1, SA553Type1, SA553 Type I, or ASME SA553 Type I - all referring to the same 9% nickel cryogenic pressure vessel steel. This guide uses the standardized designation SA553 Type 1 throughout.
SA553 Type 1 Chemical and Mechanical Properties: Complete Technical Breakdown
Engineers and procurement specialists require precise, verifiable data when specifying materials for critical cryogenic applications. Below we present a comprehensive technical summary of SA553 Type 1 based on ASME SA-553/SA-553M and ASTM A553/A553M standards. All data cited has been sourced from current standard documentation and independently verified.
SA553 Type 1 Chemical Composition
The following table presents the standard chemical composition limits for SA553 Type 1 material per the ASME SA-553 specification. These values represent heat analysis requirements.
| Element | Requirement (Heat Analysis) | Requirement (Product Analysis) |
|---|---|---|
| Carbon (C), max | 0.13% | 0.13% |
| Manganese (Mn), max | 0.90% | 0.98% |
| Phosphorus (P), max | 0.035% | 0.035% |
| Sulfur (S), max | 0.040% | 0.040% |
| Silicon (Si) | 0.15% – 0.40% | 0.13% – 0.45% |
| Nickel (Ni) | 8.50% – 9.50% | 8.40% – 9.60% |
| Iron (Fe) | Balance | Balance |
SA553 Type 1 Mechanical Properties
| Mechanical Property | Value | Unit |
|---|---|---|
| Tensile Strength, Ultimate | 690 – 825 | MPa |
| Tensile Strength (equivalent) | 100,000 – 120,000 | psi |
| Yield Strength (0.2% offset), min | 585 | MPa |
| Yield Strength (equivalent) | 84,800 | psi |
| Elongation at Break (in 50 mm), min | 20% | % |
| Impact Test Temperature (Type I) | -195°C (-320°F) | – |
| Minimum Impact Energy at -195°C (Charpy V-notch, transverse) | ≥ 27 J | Joules |
| Minimum Lateral Expansion at -195°C | ≥ 0.381 mm | mm |
| Density | 7.70 – 8.03 × 1000 kg/m³ | g/cm³ |
| Elastic Modulus | 190 – 210 | GPa |
| Poisson's Ratio | 0.27 – 0.30 | – |
SA553 Type 1 Heat Treatment Requirements
All SA553 Type 1 plates must undergo a strictly controlled two-stage heat treatment process per the standard: heating plates to a suitable temperature within the range of 800 to 925°C (1475 to 1700°F), holding for sufficient time to achieve uniform temperature through the full plate thickness, followed by rapid water quenching. Subsequently, plates are tempered within the range of 565 to 635°C (1050 to 1175°F), with a minimum holding time of 30 minutes per inch (1.2 min/mm) of thickness but no less than 15 minutes, followed by air cooling or equivalent.This Quenching + Tempering (Q+T) condition is mandatory and ensures the optimal balance of strength and cryogenic toughness that defines SA553 Type 1 material.
Why SA553 Type 1 Is the Preferred Material for Cryogenic Pressure Vessels
Engineers have relied on 9% nickel steel - specifically SA553 Type 1 - for decades as the benchmark material for cryogenic pressure vessel construction.The reasons for this enduring preference are grounded in fundamental metallurgical principles that translate directly into operational reliability and safety.
Outstanding Cryogenic Toughness of SA553 Type 1
At cryogenic temperatures approaching -196°C, most ferritic steels undergo a ductile-to-brittle transition and become susceptible to brittle fracture. SA553 Type 1 overcomes this limitation through its carefully balanced 9% nickel content and specialized heat treatment, which together produce a fine-grained martensitic structure containing retained austenite phases that impede crack propagation at extreme low temperatures.The material's minimum Charpy V-notch impact energy of 27 J at -196°C - and its lateral expansion requirement of at least 0.381 mm - provides a statistically robust safety margin that has been validated through decades of field service across thousands of LNG storage tanks, cryogenic transport vessels, and industrial gas storage systems worldwide.
High Strength-to-Weight Ratio of SA553 Type 1
With a minimum yield strength of 585 MPa (84,800 psi) and a tensile strength range of 690 to 825 MPa (100,000 to 120,000 psi), SA553 Type 1 enables vessel designers to reduce wall thickness without compromising structural integrity. This directly translates into lower steel consumption, reduced vessel weight, simpler foundation requirements, and significant cost savings in transportation and erection of large LNG storage tanks.
Superior Weldability of SA553 Type 1
The low carbon content (max 0.13%) of SA553 Type 1 minimizes the risk of cold cracking in the heat-affected zone during welding, enabling the use of conventional fusion welding processes including SMAW, SAW, GMAW, and TIG with properly matched nickel-based filler metals. This makes shop fabrication and field erection more practical and cost-effective compared to austenitic stainless steels that require more specialized welding procedures and more expensive consumables.
SA553 Type 1 vs. SA553 Type 2: Understanding the Differences
When specifying SA553 Type 1 for a project, it is essential to understand how it differs from Type 2 within the same ASME specification to ensure the correct material is selected for the intended service conditions.
| Parameter | SA553 Type 1 | SA553 Type 2 |
|---|---|---|
| Nickel Content | 8.50% – 9.50% | 7.50% – 8.50% |
| Common Nickname | "9% Nickel Steel" | "8% Nickel Steel" |
| Impact Test Temperature | -195°C (-320°F) | -170°C (-275°F) |
| Minimum Service Temperature | -196°C (LNG, O₂, N₂, Ar) | -170°C |
| Primary Applications | LNG storage tanks, cryogenic transport, liquid oxygen/nitrogen vessels |
Moderate cryogenic and refrigerated pressure vessels |
SA553 Type 1 with its higher nickel content and lower certified impact temperature is the clear choice for the most demanding cryogenic applications such as LNG peak-shaving plants, ethylene storage terminals, and air separation unit storage. Type 2, while economical for less severe temperature requirements, cannot match the fracture toughness of SA553 Type 1 at -196°C.
SA553 Type 1 Applications: Where This 9% Nickel Steel Is Used
The exceptional cryogenic properties of SA553 Type 1 make it the material of choice for a wide range of critical industrial applications where failure is not an option.
Liquefied Natural Gas (LNG) Storage Tanks
9%Ni steel - as per ASME SA553 Type I - is the reference material for the fabrication of large LNG flat-bottom above-ground storage tanks servicing at -163°C/-260°F, and the industry has decades of experience with this alloy.SA553 Type 1 is specified in API 620 Appendix Q as the approved material for the inner shell of double-walled LNG storage systems.
Cryogenic Gas Transport and Storage
Our range of SA553 Type 1 9% nickel steels is ideal for containing or transporting liquefied gases such as nitrogen, oxygen, and argon, which must be stored at temperatures below -196°C.These double-walled cryogenic pressure vessels with vacuum insulation between the layers demand absolute material integrity, and SA553 Type 1 delivers proven reliability backed by decades of service data.
Air Separation Units and Industrial Gas Plants
Liquid nitrogen and liquid oxygen storage systems in air separation units depend on SA553 Type 1 plates for inner vessel shells. The material's combination of high strength, cryogenic toughness, and weldability enables efficient fabrication of both shop-built and field-erected cryogenic storage vessels for industrial gas producers.
Ethylene and Petrochemical Cryogenic Storage
Ethylene is stored at approximately -104°C, placing it well within the certified operating range of SA553 Type 1. Petrochemical plants worldwide rely on this material grade for ethylene storage spheres and cryogenic transport tanks due to its proven resistance to brittle fracture under sustained low-temperature loading.
SA553 Type 1 Size Capabilities and Stock Availability at GNEE
One of the key differentiators that GNEE offers as a dedicated manufacturer of SA553 Type 1 is our flexible production capability and consistent inventory availability.
SA553 Type 1 Production Dimensions (GNEE)
| Parameter | Capability |
|---|---|
| Thickness Range | 3 mm – 260 mm |
| Width Range | 1,000 mm – 4,000 mm |
| Length Range | 1,000 mm – 18,000 mm |
| Delivery Condition | Q+T (Quenched and Tempered) |
| Minimum Order Quantity | 1 piece |
| Stock Status | Available (regular sizes in stock) |
| Mill Test Certificate | EN 10204 3.1 / 3.2 - Provided |
| Production Lead Time | 10 – 40 days (depending on specifications) |
| Payment Terms | T/T, L/C at sight |
| Customization Service | Available (cut to size, edge preparation, forming) |
Standard SA553 Type 1 Stock Sizes (Commonly Available)
| Thickness (mm) | Width (mm) | Length (mm) |
|---|---|---|
| 6 | 2,000 – 2,500 | 6,000 – 12,000 |
| 8 | 2,000 – 2,500 | 6,000 – 12,000 |
| 10 | 2,000 – 3,000 | 6,000 – 12,000 |
| 12 | 2,000 – 3,000 | 6,000 – 12,000 |
| 16 | 2,000 – 3,200 | 6,000 – 12,000 |
| 20 | 2,000 – 3,200 | 6,000 – 12,000 |
| 25 | 2,000 – 3,500 | 6,000 – 12,000 |
| 30 | 2,000 – 3,500 | 6,000 – 12,000 |
| 40 | 2,000 – 3,500 | 6,000 – 12,000 |
| 50 | 2,000 – 3,500 | 6,000 – 12,000 |
Note: Custom sizes available upon request. Above are indicative common stock dimensions only; please contact GNEE for the latest inventory update.
Value-Added Processing Services
In addition to supplying SA553 Type 1 plates in standard dimensions, GNEE provides advanced processing services including:
- Cutting (plasma, laser, water jet - any size and any shape)
- Beveling and edge preparation (for welding fit-up)
- Drilling and machining
- Bending and forming
- Stress relieving (post-forming)
- Pre-fabrication welding (steel structure assemblies)
Conclusion: Why SA553 Type 1 from GNEE Is the Right Choice for Your Cryogenic Project
When you specify or procure SA553 Type 1 pressure vessel steel, you are not simply purchasing a commodity product - you are investing in the safety, durability, and code compliance of mission-critical cryogenic equipment that must perform flawlessly for decades at extreme sub-zero temperatures.
GNEE Steel brings together everything that matters: 18+ years of metallurgical and export experience, direct affiliation with Angang Group's world-class steelmaking capabilities, an ISO-certified manufacturing footprint covering 40,000 square meters, and a proven track record of supplying SA553 Type 1 plates to satisfied customers in over 150 countries.
Don't leave the success of your next cryogenic pressure vessel project to chance. Contact GNEE Steel today for a competitive price quotation, detailed technical consultation, and reliable delivery of fully certified SA553 Type 1 9% nickel alloy steel plates manufactured to ASME SA-553, ASTM A553, and API 620 Appendix Q specifications.
Free samples available upon request - Partner with GNEE for certified SA553 Type 1 steel you can trust.
FAQ
Q1: Is SA553 Type 1 the same as ASTM A553 Type I?
Yes. ASME SA-553 Type I is identical to ASTM A553 Type I. The "SA" prefix indicates the ASME Boiler and Pressure Vessel Code designation, while the "A" prefix denotes the ASTM standard - both reference the same material specification, chemical requirements, and mechanical test requirements.
Q2: What is the difference between SA553 Type 1 and Type 2?
The primary difference is the nickel content: SA553 Type 1 contains 8.50% to 9.50% nickel and is impact tested at -195°C, whereas Type 2 contains 7.50% to 8.50% nickel and is impact tested at -170°C.
Q3: What is the maximum thickness available for SA553 Type 1?
The standard specification places no absolute maximum thickness - the limit is determined by the mill's ability to meet the specified mechanical property and impact test requirements through the full thickness. In current mill practice, SA553 Type 1 is routinely available up to 50 mm, and GNEE offers production capability up to 260 mm in certain widths.
Q4: Does GNEE offer third-party inspection for SA553 Type 1?
Yes. GNEE welcomes third-party inspection by SGS, Bureau Veritas, TÜV, Lloyd's Register, DNV, ABS, or any customer-nominated inspection agency during production and prior to shipment.
Q5: Can I get a free sample of SA553 Type 1?
Yes. GNEE offers free A4-sized sample plates for customer evaluation and lab testing. Simply contact our sales team with your sample request and delivery address, and we will arrange shipment to your designated laboratory or receiving location.
