Alloy Steel
Alloy Steel
Low-alloy and high-alloy engineering steels containing chromium, molybdenum, nickel, vanadium, or combinations. Used where higher strength or hardenability than plain carbon steel is required.
Grades
AISI 4130 / 25CrMo4 / EN18
AISI 4130 (25CrMo4, EN18) — chromium-molybdenum alloy steel combining good strength, weldability, and toughness for oil & gas, aerospace, and structural engineering applications.
AISI 4140
Chromium-molybdenum low-alloy steel offering high tensile strength, toughness, and fatigue resistance — one of the most widely used engineering steels globally.
AISI 4145 / 4145H
AISI 4145 / 4145H — the standard CrMo alloy steel for oil & gas drill collars, HWDP, and BHA components per API Spec 7-1. Higher carbon than 4140 (0.43-0.49% vs 0.38-0.43%) for greater hardness and wear resistance in downhole service. Available as round bar, heavy hollow bar, and forgings.
AISI 4330V / 4330 MOD
AISI 4330V / 4330 MOD (AMS 6411) — high-performance NiCrMoV alloy steel. Superior toughness at Class 2 strength levels vs 4145H. The preferred material for demanding deepwater, HPHT, and high-performance BHA components per API Spec 7-1 Class 2 (150 ksi / 1034 MPa min YS).
AISI 4340 / EN24 / 817M40
AISI 4340 (36CrNiMo4, EN24, 817M40) — Ni-Cr-Mo ultra-high-strength alloy steel with exceptional toughness, deep hardenability, and fatigue resistance for oil & gas, aerospace, and heavy engineering.
EN26 / 826M40 / 30CrNiMo8 / 1.6580
EN26 / 826M40 / 30CrNiMo8 (1.6580) — high-alloy NiCrMo steel for very large sections. Reliable Q&T through-hardening to 200-250 mm diameter. Higher Ni (2.50-3.00%) and Cr (0.90-1.20%) than 4340/EN24, giving superior hardenability for heavy forgings, large shafts, and pressure vessel components where 4340 hardenability is insufficient.
EN30B / 835M30 / 36NiCrMo16 / 1.6773
EN30B / 835M30 (closest DIN: 36NiCrMo16, 1.6773) - the highest-alloy grade in the BS 970 NiCrMo through-hardening series. Ni 3.90-4.30%. Reliable Q&T through-hardening to 300+ mm diameter. Specified for very large forgings, heavy shafts, and ultra-high toughness applications where EN26 hardenability is insufficient. Specialist indent grade with extended lead times.
EN36 / 655M13 / 14NiCr14
EN36 / 655M13 (14NiCr14) — high-nickel case hardening steel delivering a hard, wear-resistant case with a tough, shock-resistant core for gears, shafts, and heavy-duty automotive and mining components.
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