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Alloy Steel

alloy steel products
Alloy steel is a high-strength material that contains various alloying elements such as chromium, nickel, molybdenum, manganese, and vanadium to enhance its mechanical properties. These elements improve hardness, toughness, wear resistance, and corrosion resistance, making alloy steel suitable for demanding applications. It offers superior strength compared to carbon steel while maintaining good machinability and weldability. Alloy steel is widely used in industries such as oil & gas, petrochemical, power generation, aerospace, construction, and automotive due to its ability to withstand extreme temperatures, high pressure, and harsh environments.
ASTM/ASME

Alloy Steel Specifications

Standard

ASTM, ASME, API, DIN, EN, JIS, ISO

Grades

ASTM A182 F5/F9/F11/F22/F91, ASTM A335 P1/P5/P9/P11/P22/P91, ASTM A387 Gr. 5/9/11/22/91, ASTM A213 T5/T9/T11/T22/T91

Applications

Oil & Gas, Petrochemical, Power Generation, Aerospace, Automotive, Construction, Heavy Engineering, High-Temperature and Pressure Applications

ASTM/ASME

A182, A335, A387, A213, A234, A691, A193, A194, A533

Forms and Products

Pipes and Tubes, Buttweld Fittings, Flanges, Forged Fittings, Sheets, Plates, and Coils, Bars and Rods, Fasteners, Filler Wire, Outlet

Types

Low Alloy Steel, High Alloy Steel, Heat-Resistant Alloy Steel, Corrosion-Resistant Alloy Steel
Available in all grades

Alloy Steel Products

flanges suppliers
Flanges
ASME B16.5, B16.47, MSS-SP-44
buttweld suppliers
Buttweld Fittings
ASME B16.9, B16.28, MSS-SP-43
forged suppliers
Forged Fittings
ASME B16.11, MSS-SP-79, 83, 97
fasteners suppliers
Fasteners
ASME B18.2.1, B18.2.2
pipes tubes suppliers
Pipes Tubes
ASME B36.10, EN 10217 / EN 10216
outlets suppliers
Outlets
MSS-SP-97, ASME B16.11
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ASTM / ASME

Equivalent Grades

Grade ASTM EN (DIN) JIS GOST BS AFNOR
4130 A519 1.7220 (30CrMo) SCM430 40Х (40H) 4130S Z6C3S
4140 A519 1.7225 (42CrMo4) SCM440 40ХН (40HN) 4140S Z6C4S
4340 A508 1.6564 (34CrNiMo6) SCM440 45Х2М (45X2M) 4340S Z6C4S
8620 A574 1.6523 (20CrMo) SCM620 20Х (20H) 8620S Z6C3S
9310 A829 1.5961 (10NiCrMo9) SCM910 25Х2Н (25X2H) 9310S Z6C3S
ASME / ASTM

Chemical Composition

Grade C Mn P S Cr Mo Ni Si Fe
4130 0.28-0.33 0.60-0.90 ≤0.035 ≤0.040 0.40-0.60 0.15-0.25 0.10-0.40 0.15-0.40 Balance
4140 0.38-0.43 0.75-1.00 ≤0.035 ≤0.040 0.80-1.10 0.15-0.25 0.15-0.40 0.15-0.40 Balance
4340 0.38-0.43 0.60-0.80 ≤0.035 ≤0.040 0.70-0.90 0.15-0.25 1.50-2.00 0.15-0.40 Balance
8620 0.18-0.23 0.60-0.90 ≤0.035 ≤0.040 0.30-0.60 0.15-0.25 0.70-1.00 0.15-0.40 Balance
9310 0.18-0.23 0.40-0.60 ≤0.035 ≤0.040 0.40-0.60 0.20-0.30 1.40-1.80 0.15-0.40 Balance
ASME / ASTM

Mechanical Properties

Grade Yield Strength (MPa) Tensile Strength (MPa) Elongation (%) Hardness (HB) Impact Energy (J)
4130 310-450 560-750 20-25 197-262 27 (at -20°C)
4140 415-620 655-850 15-20 217-285 27 (at -20°C)
4340 460-780 760-980 12-18 235-302 35 (at -20°C)
8620 345-500 570-750 20-25 197-270 35 (at -20°C)
9310 450-690 690-910 12-18 225-302 45 (at -20°C)