SA 516 Gr 70 temperature range

SA 516 Gr 70 Temperature Range

SA 516 Gr 70 is a carbon steel plate grade specified under ASME Section II, Part A, SA-516, designed for moderate and lower temperature service in pressure vessels. Known for its excellent weldability, formability, and impact toughness, SA 516 Gr 70 is widely used in boilers, storage tanks, and pressure vessels where temperatures can drop to sub-zero levels. This article explores the temperature range for SA 516 Gr 70, its chemical composition, mechanical properties, and applications, including comparisons with related grades like ASME SA 516 GR 65, ASME SA 516 GR 55, and ASME SA 516 GR 60. For more details, visit our ASME SA 516 GR 70 steel plate.

SA 516 Gr 70 Temperature Range

The temperature range for SA 516 Gr 70 is a key consideration for its use in pressure vessels and boilers. Per ASME SA-516, SA 516 Gr 70 is suitable for service temperatures from -46°C (-50°F) to 343°C (650°F), with specific impact testing to ensure toughness at low temperatures.

• Low-Temperature Limit: The grade is qualified for -46°C with Charpy V-notch impact testing at that temperature, ensuring resistance to brittle fracture in sub-zero conditions common in cold climates or refrigerated storage.
• High-Temperature Limit: Up to 343°C, beyond which creep strength may degrade, making it suitable for moderate-temperature pressure vessels but not high-heat boilers (use SA 516 Gr 70N for normalized condition if needed).
• Impact Testing: Required at -46°C for thicknesses >13 mm, with minimum average Charpy energy of 27 J (20 ft-lb) for longitudinal specimens, per ASME SA-516.

This range makes SA 516 Gr 70 versatile for low to medium-temperature services, outperforming lower grades like ASME SA 516 GR 55 or ASME SA 516 GR 60 in toughness, but with slightly less elevation than ASME SA 516 GR 65.

Chemical Composition of SA 516 Gr 70

The chemical composition of SA 516 Gr 70 is controlled to ensure weldability and toughness:

Carbon Equivalent (CEV): Not specified, but typically ≤0.43% for weldability, calculated as CEV = C + Mn/6 + (Cr + Mo + V)/5 + (Ni + Cu)/15. The low carbon and manganese content supports the temperature range, with impact testing ensuring performance at -46°C.

Mechanical Properties of SA 516 Gr 70

The mechanical properties support its use across the temperature range:

• Yield Strength: Minimum 38 ksi (260 MPa) for thin plates, decreasing with thickness, suitable for low-temperature service.
• Tensile Strength: 70-90 ksi (485-620 MPa) ensures durability.
• Elongation: ≥27% for ductility.
• Impact Toughness: ≥20 ft-lb (27 J) at -46°C per Charpy V-notch, qualifying it for the temperature range.

Comparison with Other SA 516 Grades

SA 516 Gr 70 offers superior strength and toughness for the -46°C range compared to Gr 55 and Gr 60, but Gr 65 is closer in elevation for higher-strength needs.

Welding and Heat Treatment

SA 516 Gr 70 is weldable:

• Welding: Compatible with SMAW, GMAW, SAW per ASME Section IX. Preheating (149-204°C for >38 mm) to prevent cracking; PWHT (593-649°C) for stress relief in thick sections.
• Consumables: E7018 electrodes for SMAW; ER70S-6 wire for GMAW.

The low CEV supports welding across the temperature range.

Applications

SA 516 Gr 70 is used in:

• Pressure Vessels: Boilers, storage tanks for low to medium temperatures (-46°C to 343°C).
• Offshore Structures: Cold marine applications with impact toughness.
• Petrochemical Tanks: Liquid storage in sub-zero conditions.

Explore ASME SA 516 GR 70 steel plate.

Why Choose Gangsteel?

Gangsteel supplies SA 516 Gr 70:

• Inventory: Extensive stock in China.
• Sizes: Thickness 6-200 mm, widths up to 3000 mm.
• Delivery: 7-30 days globally.
• Certifications: ASME SA-516, UT testing, ABS/LR/BV/DNV approvals.
• Processing: Cutting, rolling, bending.

Contact us for ASME SA 516 GR 70 steel plate.

FAQ

What is the SA 516 Gr 70 temperature range?
SA 516 Gr 70 is suitable for -46°C to 343°C, with impact testing at -46°C (≥27 J), ideal for low-temperature pressure vessels and boilers, outperforming Gr 55/60 in cold performance.

How does SA 516 Gr 70 compare to ASME SA 516 GR 65?
SA 516 Gr 70 has higher yield (260 MPa vs 240 MPa) and tensile strength (485-620 MPa vs 450-585 MPa), with similar -46°C toughness, for higher-strength pressure vessels; Gr 65 is for moderate loads.

What is the SA 516 Gr 70 yield strength?
SA 516 Gr 70 has a minimum yield strength of 38 ksi (260 MPa) for ≤25 mm, decreasing to 34 ksi (235 MPa) for >100 mm, supporting moderate to high-pressure applications.

Is SA 516 Gr 70 weldable?
Yes, SA 516 Gr 70 is weldable with low carbon (0.27%) and CEV ~0.43%, using SMAW/GMAW with preheating (149-204°C for >38 mm) and PWHT (593-649°C) for thick sections.

What applications use SA 516 Gr 70?
SA 516 Gr 70 is used in pressure vessels, boilers, storage tanks, and offshore structures for low to medium temperatures (-46°C to 343°C), with impact toughness for cold service.

How does SA 516 Gr 70 differ from ASME SA 516 GR 60?
SA 516 Gr 70 has higher yield (260 MPa vs 220 MPa) and tensile strength (485-620 MPa vs 415-550 MPa), with required -46°C toughness, for higher-pressure vessels; Gr 60 is for moderate service.