ASTM A105 Carbon Steel
We are ASTM A105 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 forged carbon steel products to various industries. We specialize in manufacturing and supplying ASTM A105 Carbon Steels (ASTM A105 / ASME SA105 / UNS K03504 / EN 10222-2 P250GH / DIN 1.0460 C22.8) that meet national and international quality standards for high-pressure piping systems, oil and gas refineries, petrochemical plants, power generation, and valve manufacturing applications. ASTM A105 Carbon Steel is the premier specification for forged carbon steel piping components, including flanges, forged fittings, valves, rings, and pressure vessel nozzles intended for high-temperature and ambient service in pressure systems. Featuring a minimum tensile strength of 485 MPa (70 ksi) and a minimum yield strength of 250 MPa (36 ksi), ASTM A105 provides superior machinability, high impact resistance, excellent forgeability, and reliable pressure seal integrity under ASME B16.5 and ASME B16.11 standards. Heat treated by normalizing, annealing, or quenching and tempering, ASTM A105 delivers uniform micro-structural grain refinement, preventing grain coarsening and ensuring long-term pressure containment. This carbon steel grade is widely used for manufacturing weld neck flanges, blind flanges, socket weld fittings, threaded couplings, forged valve bodies, rings, and heavy forged shafts.
Our ASTM A105 Carbon Steels are 100% Prime – Tested & Guaranteed, ensuring precise chemical composition, low carbon equivalent (CE), ultrasonic flaw-free cleanliness, and consistent mechanical strength. Each product is supplied with proper Mill Test Certificates (MTC) conforming to ASTM A105 / ASME SA105 standards with EN 10204 3.1 / 3.2 certification. STEEL MART follows strict quality control procedures and ensures timely delivery.
What is ASTM A105 Carbon Steel?
ASTM A105 Carbon Steel (ASTM A105 / ASME SA105 / UNS K03504 / EN 10222-2 P250GH / DIN 1.0460 C22.8) is a forged low carbon steel specification engineered for piping applications such as ASME B16.5 flanges, forged fittings, valve bodies, pressure vessel nozzles, and high-pressure steam components. Heat treated by normalizing or annealing, it offers superior tensile strength (485 MPa Min), guaranteed 250 MPa yield strength, high pressure seal integrity, and excellent weldability.
485 MPa Tensile Strength
Guarantees minimum tensile strength of 485 MPa (70 ksi) for high-pressure rating.
ASME Code Weldability
Low carbon equivalent enables sound butt welding, socket welding, and seal welding.
High Forgeability
Allows closed-die forging and ring rolling without internal micro-cracks or voids.
Normalized Toughness
Normalized heat treatment provides Charpy V-notch impact toughness for ambient & high temp use.
High Temperature Stability
Maintains mechanical properties up to 425°C (800°F) continuous pressure operating service.
100% UT Flaw Tested
Supplied with complete chemical heat analysis and EN 10204 3.1 Mill Test Certificates.
Why Choose STEEL MART for ASTM A105 Carbon Steel
STEEL MART is the preferred choice for purchasing ASTM A105 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 ASTM A105 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 ASTM A105 Carbon Steels, STEEL MART also supplies a wide range of carbon steel and alloy steel products for various industrial applications.
Chemical Composition of ASTM A105 Carbon Steel
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.35 % Max |
| Manganese (Mn) | 0.60 – 1.05 % |
| Silicon (Si) | 0.10 – 0.35 % |
| Sulphur (S) | 0.040 % Max |
| Phosphorus (P) | 0.035 % Max |
| Copper / Nickel / Chrome | Cu 0.40% / Ni 0.40% / Cr 0.30% Max |
This chemical composition ensures optimal strength, pressure resistance, and weldability.
Equivalent Grades of ASTM A105 Carbon Steel
| Standard | Equivalent Grade |
|---|---|
| ASTM / ASME | ASTM A105 / ASME SA105 / UNS K03504 |
| DIN / W.Nr. | DIN 17243 C22.8 / 1.0460 / C21 |
| EN Standard | EN 10222-2 P250GH / P280GH / 1.0460 |
| BS Standard | BS 1503 224 490 / BS 4360 43A |
| IS Standard | IS 2002 Class 2 / IS 1875 Class 2 |
These equivalent grades ensure global compatibility across projects.
Mechanical Properties of ASTM A105 Carbon Steel
The mechanical properties of ASTM A105 Carbon Steels make them suitable for high pressure forged piping and valve applications. In normalized (+N) condition, this grade delivers superior tensile strength and hardness control (Max 187 HB).
Heat Treatment & Processing of ASTM A105 Carbon Steel
ASTM A105 Carbon Steels can be processed using standard heat treatment techniques.
Normalizing (+N)
Heated to 880°C–920°C and air-cooled to refine forged grain structure.
Annealing
Heated to 850°C–890°C for maximum cold softness and machinability.
Quenching & Tempering
Quenched in liquid and tempered at 590°C–680°C for high strength forgings.
CNC Machining & Turning
Machined into ANSI B16.5 flanges, threadings, and socket weld fittings.
ASTM A105 Carbon Steel Industry Applications
ASTM A105 Carbon Steels are widely used across multiple industrial sectors.
Oil & Gas Piping
Used for ANSI B16.5 weld neck, blind, slip-on, and threaded flanges.
Forged Pressure Fittings
Used for ASME B16.11 3000# / 6000# socket weld tees, elbows, and couplings.
Valve Bodies & Bonnets
Used for forged gate, globe, check, and ball valve bodies and bonnets.
Power Plant Steam Piping
Used for high-pressure steam headers, boiler nozzles, and manways.
Petrochemical Refineries
Used for heat exchanger tube sheets, companion flanges, and orifice plates.
Heavy Forged Rings & Shafts
Used for seamless rolled rings, forged discs, and heavy equipment shafts.
Availability and Customization
At STEEL MART, we supply ASTM A105 Carbon Steels in a wide range of sizes and specifications.
| Forging Size / Diameter | Forged bars from 20 mm to 500 mm, flanges 1/2" to 60" NB |
| Rating Classes | Flanges 150#, 300#, 600#, 900#, 1500#, 2500#; Fittings 3000#, 6000# |
| Condition | Available in As-Forged / Normalized (+N) / Quenched & Tempered |
| Forms | Flanges, Forged Fittings, Round Bars, Rolled Rings, Discs, Valve Bodies |
| Customization | Custom CNC machining, drilling, facing, and threading per ASME drawings |
| Services | MPI (Magnetic Particle Inspection), UT Testing, NDT, and TPI available |
| Certification | Supplied with ASTM A105 / ASME SA105 MTC and EN 10204 3.1 / 3.2 reports |
Our strict quality control ensures consistent quality.
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ASTM A105 Carbon Steel (ASTM A105 / ASME SA105 / UNS K03504 / EN 10222-2 P250GH / DIN 1.0460 C22.8) is the premier forged carbon steel specification widely used for ASME B16.5 flanges, forged fittings, valve bodies, pressure vessel nozzles, and high-pressure steam piping. Featuring 485 MPa minimum tensile strength, guaranteed 250 MPa yield strength, fine-grain normalized structure, and max 187 HB hardness, it provides long-term pressure seal security for oil refineries, chemical plants, power stations, and steam pipelines. Supplied by STEEL MART with strict quality control, NDT testing, and EN 10204 3.1/3.2 Mill Test Certification, ASTM A105 Carbon Steel is a cost-effective and dependable solution for engineering applications.
Frequently Asked Questions
Common answers regarding ASTM A105 Carbon Steel specifications and parameters.
ASTM A105 specifies a maximum hardness limit of 187 HBW to ensure toughness and prevent stress corrosion cracking.
Normalizing is required for Class 300 and higher pressure rating flanges, for forgings over 4 inches thick, and for piping components operating above 400°C.
DIN 17243 C22.8 (1.0460), EN 10222-2 P250GH / P280GH, BS 1503 224 490, and IS 2002 Class 2 / IS 1875 Class 2.
Yes, its controlled carbon equivalent allows sound butt welding and socket welding with standard E7018 electrodes.
Weld neck flanges, blind flanges, socket weld fittings, threaded fittings, valve bodies, forged round bars, and seamless rolled rings.