SA 516 GR 70 Carbon Steel
We are SA 516 GR 70 Carbon Steel Manufacturers, Suppliers, and Exporters in Mumbai, India. STEEL MART is an ISO 9001:2015 certified company established in 1986, with decades of experience in supplying high-quality boiler quality carbon steel plates to various industries. We specialize in manufacturing and supplying SA 516 GR 70 Carbon Steels (ASME SA 516 Grade 70 / ASTM A516 Grade 70 / UNS K02700 / P355GH / 1.0473) that meet national and international quality standards for oil and gas refineries, petrochemical plants, power generation boilers, cryogenic storage tanks, and chemical reactors. SA 516 GR 70 Carbon Steel is the premier ASME boiler and pressure vessel steel plate specification intended primarily for service in welded pressure vessels where improved notch toughness and superior strength are required. Featuring a tensile strength of 485–620 MPa (70–90 ksi) and a minimum yield strength of 260 MPa (38 ksi), SA 516 Grade 70 delivers high resistance to brittle fracture at moderate to sub-zero temperatures (down to -46°C). When normalized (+N) and vacuum degassed, SA 516 GR 70 provides exceptional internal cleanliness, hydrogen-induced cracking (HIC) resistance, sulfide stress cracking (SSC) resistance, and high weldability under stringent ASME codes. This carbon steel grade is widely used for manufacturing boiler drums, heat exchangers, distillation columns, gas storage spheres, pressure vessel shells, and heavy welded flanges.
Our SA 516 GR 70 Carbon Steels are 100% Prime – Tested & Guaranteed, ensuring precise chemical composition, fine grain silicon-killed micro-structure, ultrasonic cleanliness (UT Tested as per ASTM A578 Level A/B), and consistent mechanical properties. Each plate is supplied with proper Mill Test Certificates (MTC) conforming to ASME SA-516 / ASTM A516 standards with EN 10204 3.1 / 3.2 certification. STEEL MART follows strict quality control procedures and ensures timely delivery.
What is SA 516 GR 70 Carbon Steel?
SA 516 GR 70 Carbon Steel (ASME SA 516 Grade 70 / ASTM A516 Grade 70 / UNS K02700 / P355GH / 1.0473) is a fine-grain silicon-killed carbon-manganese steel plate engineered specifically for boiler drums, welded pressure vessels, heat exchangers, and cryogenic gas storage tanks. Normalized to ensure high Charpy V-notch sub-zero impact toughness (down to -46°C), it delivers exceptional tensile strength (485-620 MPa), guaranteed 260 MPa yield strength, and superior weldability under ASME Boiler and Pressure Vessel Code standards.
485-620 MPa Tensile Strength
Guarantees high tensile and pressure containment rating for boiler vessels.
ASME Code Weldability
Controlled Carbon Equivalent ensures flawless SMAW, SAW, and GTAW pressure joints.
Fine Grain Silicon Killed
Vacuum degassed silicon killed process eliminates internal gaseous inclusions.
Sub-Zero Impact Energy
Normalized plates achieve high Charpy V-notch toughness down to -46°C (-50°F).
HIC / SOHIC Tested Option
Resists sour gas environmental cracking (NACE MR0175 / ISO 15156 compliant).
Ultrasonic Tested (UT)
100% UT tested as per ASTM A578 Level A/B with EN 10204 3.1 / 3.2 certification.
Why Choose STEEL MART for SA 516 GR 70 Carbon Steel
STEEL MART is the preferred choice for purchasing SA 516 GR 70 Carbon Steel due to its strong reputation for quality and reliability. With over 40 years of experience in the steel industry, the company ensures that every product meets strict industry standards. The company follows strict quality inspection procedures to ensure that every SA 516 GR 70 Carbon Steel product meets international standards.
Each product is carefully tested to ensure durability, strength, and performance. Customers trust STEEL MART for consistent quality, competitive pricing, and timely delivery. The company maintains a large inventory to meet urgent and bulk requirements efficiently. In addition to SA 516 GR 70 Carbon Steels, STEEL MART also supplies a wide range of carbon steel and alloy steel products for various industrial applications.
Chemical Composition of SA 516 GR 70 Carbon Steel
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.27 % Max |
| Manganese (Mn) | 0.85 – 1.20 % |
| Silicon (Si) | 0.15 – 0.40 % |
| Sulphur (S) | 0.025 % Max |
| Phosphorus (P) | 0.025 % Max |
This chemical composition ensures optimal strength, pressure resistance, and weldability.
Equivalent Grades of SA 516 GR 70 Carbon Steel
| Standard | Equivalent Grade |
|---|---|
| ASME / ASTM | SA 516 Grade 70 / ASTM A516 Grade 70 / UNS K02700 |
| EN Standard | EN 10028-2 P355GH / 1.0473 / P355NH |
| BS Standard | BS 1501 224 490A / 490B |
| DIN / W.Nr. | DIN 17155 19Mn6 / 1.0473 |
| IS Standard | IS 2002 Grade 3 / IS 2041 |
These equivalent grades ensure global compatibility across projects.
Mechanical Properties of SA 516 GR 70 Carbon Steel
The mechanical properties of SA 516 GR 70 Carbon Steels make them suitable for high pressure, elevated temperature, and cryogenic boiler applications. In normalized (+N) condition, this grade delivers superior tensile strength and sub-zero impact toughness.
Heat Treatment & Processing of SA 516 GR 70 Carbon Steel
SA 516 GR 70 Carbon Steels can be processed using standard heat treatment techniques.
Normalizing (+N)
Heated to 900°C–930°C and air-cooled for fine grain structure and impact resistance.
Stress Relieving (PWHT)
Post-Weld Heat Treatment at 600°C–650°C to eliminate residual fabrication stresses.
Vacuum Degassing
Molten steel is vacuum treated to remove hydrogen gas and inclusions.
HIC / NACE Testing
Tested for Hydrogen Induced Cracking resistance per NACE TM0284.
SA 516 GR 70 Carbon Steel Industry Applications
SA 516 GR 70 Carbon Steels are widely used across multiple industrial sectors.
Oil & Gas Refineries
Used for crude oil distillation columns, cracking units, and pressure vessels.
Power Generation Boilers
Used in steam boiler drums, deaerators, and high-pressure steam headers.
Petrochemical & Chemical
Used for chemical reactors, heat exchanger shells, and separator tanks.
Cryogenic & LPG Storage
Used for LPG / ammonia storage spheres and low-temperature gas tanks.
Heavy Flanges & Heads
Used for dished ends, ellipsoidal vessel heads, and heavy pressure flanges.
Nuclear & Fertilizer Plants
Used for steam generators, ammonia synthesis loops, and heavy autoclaves.
Availability and Customization
At STEEL MART, we supply SA 516 GR 70 Carbon Steels in a wide range of sizes and specifications.
| Plate Thickness | Plates from 5 mm to 250 mm thick |
| Width & Length | Widths up to 3500 mm, lengths up to 12000 mm |
| Condition | Available in As-Rolled / Normalized (+N) / Vacuum Degassed condition |
| Testing Options | HIC Tested, SOHIC Tested, NACE TM0284, Impact at -46°C, UT Tested |
| Customization | CNC flame cutting, dished end pressing, and edge beveling available |
| Services | Post-Weld Heat Treatment (PWHT) and Third-Party Inspection (TPI) |
| Certification | Supplied with ASME SA 516 MTC and EN 10204 3.1 / 3.2 inspection reports |
Our strict quality control ensures consistent quality.
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SA 516 GR 70 Carbon Steel (ASME SA 516 Grade 70 / ASTM A516 Grade 70 / UNS K02700 / P355GH / 1.0473) is the premier boiler and pressure vessel steel plate specified across oil refineries, petrochemical plants, power stations, and cryogenic storage facilities. Featuring 485-620 MPa tensile strength, guaranteed 260 MPa yield strength, fine-grain silicon-killed micro-structure, and sub-zero impact toughness (down to -46°C), it provides unmatched pressure containment and fracture security. Supplied by STEEL MART with strict quality control, UT testing, and ASME EN 10204 3.1/3.2 Mill Test Certification, SA 516 GR 70 Carbon Steel is a cost-effective and dependable solution for engineering applications.
Frequently Asked Questions
Common answers regarding SA 516 GR 70 Carbon Steel specifications and parameters.
SA 516 GR 70 provides a specified tensile strength of 485 to 620 MPa (70 to 90 ksi) and minimum yield strength of 260 MPa (38 ksi).
Grade 70 has higher tensile strength (485-620 MPa vs 415-550 MPa) and higher carbon content, making it suitable for higher pressure applications.
EN 10028-2 P355GH (1.0473), BS 1501 224 490A, DIN 17155 19Mn6, and IS 2002 Grade 3.
Yes, when normalized (+N), it exhibits excellent Charpy V-notch impact toughness down to -46°C (-50°F).
Yes, STEEL MART supplies HIC and SOHIC tested SA 516 GR 70 plates per NACE TM0284 for sour gas service.