Grades · Alloy & Engineering Steel

Alloy & Engineering Steel

Quenched & tempered and case-hardening engineering steels for shafts, gears and machinery — 4140/42CrMo4, 4340, 8620 and the Cr/Mn carburizing family.

1.8550 / 34CrAlNi7-10

1.8550 (34CrAlNi7-10) is the premium European nitriding steel: its aluminium is the nitride former that builds the extre…

DIN 1.8550AISI — (Nitralloy type, near)JIS — (SACM645 family, near)

100Cr6

100Cr6 is the EN designation (1.3505) of the universal 1%C–1.5%Cr bearing steel, specified under EN ISO 683-17 with defi…

DIN 1.3505 (100Cr6)AISI 52100JIS SUJ2

16MnCr5

16MnCr5 is the most common European case-hardening steel for small-to-medium gears — the EN counterpart of the 8620 conc…

DIN 1.7131 (16MnCr5)AISI 5115 (near)GB 16CrMnH (near)

17CrNiMo6

17CrNiMo6 is the classic German case-hardening steel for large, heavily loaded gears, now carried in EN 10084 as 18CrNiM…

DIN 17CrNiMo6 (DIN 17210; EN successor 18CrNiMo7-6, 1.6587)AISI 4320 (near)

18CrNiMo7-6

18CrNiMo7-6 is the EN 10084 case-hardening steel (1.6587) for the largest, most heavily loaded gears in wind, marine and…

DIN 1.6587 (18CrNiMo7-6)AISI 4320 (near)

20Cr

20Cr is China’s basic carburizing chromium steel (GB/T 3077), the counterpart of AISI 5120 and JIS SCr420 for case-harde…

DIN 1.7027 (20Cr4)AISI 5120JIS SCr420

20CrMnTi

20CrMnTi is China’s dominant carburizing gear steel (GB/T 3077): a Cr-Mn steel micro-alloyed with titanium for grain con…

AISI 4820 (near)GB 20CrMnTi (GB/T 3077)

20CrMo

20CrMo is the GB/T 3077 chromium-molybdenum carburizing steel — the molybdenum-bearing counterpart of 20Cr and the Chine…

DIN 18CrMo4 / 1.7243 (near)AISI 4118 (near)JIS SCM420

20MnCr5

20MnCr5 is the European Mn-Cr carburizing steel for larger gears and shafts, with higher core strength than 16MnCr5.…

DIN 1.7147 (20MnCr5)AISI 5120 (near)GB 20CrMnTi family (near)

30CrMnSiA

30CrMnSiA is a Chinese high-strength structural steel (GB/T 3077, of the Soviet 30KhGSA lineage) that reaches 1080 MPa c…

GB 30CrMnSiA (GB/T 3077)

30CrNiMo8

30CrNiMo8 is a high-hardenability EN Q&T steel (1.6580) with about 2% each of chromium and nickel. It is specified for l…

DIN 1.6580 (30CrNiMo8)

34CrMo4

34CrMo4 is the EN Q&T Cr-Mo steel (1.7220) one step below 42CrMo4, the European counterpart of the 4135/SCM435 family. I…

DIN 1.7220 (34CrMo4)AISI 4135 (near)JIS SCM435 (near)

34CrNiMo6

34CrNiMo6 is the EN Ni-Cr-Mo Q&T steel (1.6582) for wind-energy shafts, large gears and heavy machinery. Its balanced 1.…

DIN 1.6582 (34CrNiMo6)AISI 4337 (near)

35CrMo

35CrMo is the GB/T 3077 Cr-Mo steel between 4130 and 4140 in carbon, matching AISI 4135 and JIS SCM435 — a staple Chines…

DIN 1.7220 (34CrMo4, near)AISI 4135JIS SCM435

38CrMoAlA

38CrMoAlA is China’s standard nitriding steel (GB/T 3077): the 0.70–1.10% aluminium addition gives an exceptionally hard…

DIN 1.8509 (41CrAlMo7-10, near)AISI — (nitriding grade)JIS SACM645

40Cr

40Cr is China’s most-used alloy structural steel (GB/T 3077) — a Cr steel equivalent to AISI 5140 and JIS SCr440, stocke…

DIN 1.7035 (41Cr4)AISI 5140JIS SCr440

40CrNiMoA

40CrNiMoA is the GB/T 3077 Ni-Cr-Mo steel corresponding to AISI 4340 — China’s high-hardenability grade for large, highl…

DIN 1.6511 (36CrNiMo4, near)AISI 4340JIS SNCM439 (near)

4118

4118 is a low carbon Cr-Mo carburizing steel, the economy case-hardening grade of the 41xx family. Its small molybdenum …

DIN 20CrMo4 type (near)AISI 4118JIS SCM418

4130

4130 is a low-alloy Cr-Mo steel famous for weldable high strength in tube form — aircraft structures, racing chassis, bi…

DIN 1.7218 (25CrMo4)AISI 4130JIS SCM430

4135

4135 is the mid-carbon Cr-Mo Q&T steel one step below 4140, matching JIS SCM435 and GB 35CrMo almost exactly. It is a st…

DIN 1.7220 (34CrMo4, near)AISI 4135JIS SCM435

4140

4140 is the most popular Cr-Mo engineering steel in the world: a through-hardening grade for shafts, gears, bolts and hy…

DIN 1.7225 (42CrMo4)AISI 4140JIS SCM440

4142

4142 is a Cr-Mo steel a touch higher in carbon than 4140, giving slightly higher attainable hardness at the cost of toug…

DIN 1.7225 (42CrMo4, near)AISI 4142JIS SCM440 (near)

4145

4145 is the high-carbon end of the standard Cr-Mo bar family, widely specified in oilfield practice (drill collars, subs…

AISI 4145

4150

4150 is a 0.50% carbon Cr-Mo steel for parts needing high Q&T strength and wear resistance: gun barrels, heavy gears and…

DIN 1.7228 (50CrMo4)AISI 4150JIS SCM445 (near)

4161

4161 is a spring-range Cr-Mo steel: 5160-class carbon and chromium with molybdenum added for temper resistance and throu…

DIN 61SiCr7 is Si-type (near family)AISI 4161JIS SUP9 family (near)

42CrMo4

42CrMo4 is the EN quenched-and-tempered Cr-Mo steel (1.7225), the European counterpart of AISI 4140 and one of the highe…

DIN 1.7225 (42CrMo4)AISI 4140JIS SCM440

4320

4320 is a Ni-Cr-Mo carburizing steel whose ~1.8% nickel gives a markedly tougher core than 8620. It is specified for lar…

DIN 20NiCrMo2-2 family (near)AISI 4320JIS SNCM420

4340

4340 is a Ni-Cr-Mo steel with deep hardenability and high fatigue strength, used where 4140 runs out of section size or …

DIN 1.6511 (36CrNiMo4)AISI 4340JIS SNCM439

4620

4620 is a Ni-Mo carburizing steel without chromium: the nickel-molybdenum pair gives a tough, ductile core and a case th…

AISI 4620JIS SNCM220 family (near)

4720

4720 is a mid-nickel Ni-Cr-Mo carburizing steel between 8620 and 4320 in cost and core toughness. It serves medium-duty …

AISI 4720

4815

4815 is a high-nickel (3.5%) Ni-Mo carburizing steel for premium gears needing maximum core toughness and case fatigue r…

AISI 4815

4820

4820 is the higher-carbon companion of 4815 in the 3.5% nickel carburizing family, giving a stronger core at the same ca…

AISI 4820

50CrVA

50CrVA is China’s GB/T 1222 designation of the global 51CrV4 / AISI 6150 spring steel — the vanadium-bearing Cr spring g…

DIN 1.8159 (51CrV4)AISI 6150JIS SUP10

5120

5120 is a chromium case-hardening steel for small gears and wear parts. With about 0.8% chromium it forms a hard carburi…

DIN 1.7027 (20Cr4, near)AISI 5120JIS SCr420

5130

5130 is a medium carbon chromium steel for moderately loaded Q&T parts. It offers a hardenability step above 1030/5140-c…

DIN 28Cr4 type (near)AISI 5130JIS SCr430

5140

5140 is a medium-carbon chromium steel for moderately loaded shafts, gears and bolts — the chromium-only (no molybdenum)…

DIN 1.7035 (41Cr4)AISI 5140JIS SCr440

5150

5150 is a medium-high carbon chromium steel used for stronger springs, axles and gears. It is the chromium-step between …

DIN 50Cr4 type (near)AISI 5150JIS SCr445 (near)

5160

5160 is the classic chromium spring steel of the Americas, standard for vehicle leaf springs and agricultural blades. It…

DIN 1.7102 (54SiCr6 is Si-type; 5160 is Cr-type, near)AISI 5160JIS SUP9 (near)

5195

5195 is a high carbon chromium steel closely related to the bearing steel family, used where 1095-class hardness is need…

AISI 5195JIS SUP9 family (near)

52100

52100 is the world-standard through-hardening bearing steel (ASTM A295): about 1% carbon and 1.5% chromium, hardened to …

DIN 1.3505 (100Cr6)AISI 52100JIS SUJ2

55Cr3

55Cr3 is the EN chromium spring steel (1.7176) for hot-rolled spring bar and flat products. It occupies the same niche a…

DIN 1.7176 (55Cr3)AISI 5155 (near)JIS SUP9 family (near)

55Si7

55Si7 (1.5026) is the classic silicon spring steel of EN 10089: 1.6–2.0% silicon raises the elastic limit and temper res…

DIN 1.5026 (55Si7)AISI 9255 (near)JIS SUP7 (near)

60Si2CrA

60Si2CrA is the chromium-upgraded silicon spring steel of GB/T 1222: adding ~1% Cr to the 60Si2Mn base raises hardenabil…

AISI 9262 (near)JIS SUP12 (near)GB 60Si2CrA (GB/T 1222)

60Si2Mn

60Si2Mn is China’s standard silicon-manganese spring steel (GB/T 1222), produced in very large tonnage for vehicle and m…

DIN 1.5028 (65Si7, near)AISI 9260 (near)JIS SUP6 (near)

6150

6150 is a Cr-V spring steel: the vanadium refines grain and lifts fatigue strength, making it the premium choice for hig…

DIN 1.8159 (51CrV4)AISI 6150JIS SUP10

8115

8115 is a lean triple-alloy (Ni-Cr-Mo) carburizing steel designed for economical case hardening of small parts. Small ad…

AISI 8115

8615

8615 is the low-carbon member of the 86xx triple-alloy carburizing family, sharing 8620 alloy content at slightly lower …

AISI 8615

8617

8617 is a carburizing steel midway between 8615 and 8620 in carbon content, with the same Ni-Cr-Mo alloy package. Many m…

AISI 8617

8620

8620 is the standard carburizing (case-hardening) gear steel of the Americas: a low-carbon Ni-Cr-Mo grade that forms a h…

DIN 1.6523 (21NiCrMo2-2)AISI 8620JIS SNCM220

8630

8630 is a Q&T Ni-Cr-Mo steel for cast and forged parts — wellheads, valves and aircraft components — where its castabili…

DIN 30CrNiMo8 family is higher-alloy (near family)AISI 8630

8640

8640 is the 0.40% carbon triple-alloy Q&T steel: 4140-class strength with nickel for extra toughness, common in aircraft…

AISI 8640JIS SNCM240 (near)

8740

8740 is chemically 8640 with a higher molybdenum floor, specified where a guaranteed minimum hardenability response is r…

AISI 8740

9255

9255 is a Si-Cr spring steel combining the sag resistance of silicon with chromium hardenability. It serves coil and lea…

DIN 1.5026 (55Si7 family, near)AISI 9255JIS SUP7 (near)

9260

9260 is a silicon-manganese spring steel with about 2% silicon, giving an exceptionally high yield-to-tensile ratio and …

DIN 1.5028 (65Si7 family, near)AISI 9260JIS SUP6 (near)

9840

9840 is a Ni-Cr-Mo through-hardening steel popular in Latin American specifications for shafts and high-strength parts —…

AISI 9840GB 40CrNiMo (near)

GCr15

GCr15 is China’s standard bearing steel (GB/T 18254), the domestic designation of the 52100/100Cr6/SUJ2 family. Chinese …

DIN 1.3505 (100Cr6)AISI 52100JIS SUJ2

GCr15SiMn

GCr15SiMn is the high-hardenability bearing steel of GB/T 18254: extra silicon and manganese over GCr15 let large bearin…

DIN 1.3520 (100CrMnSi6-4, near)AISI 52100 family (near)JIS SUJ4 (near)

SCM415

SCM415 is the low-carbon Cr-Mo carburizing steel of JIS G4053 — the Japanese gear and pinion grade in the AISI 4118 clas…

DIN 1.7262 (15CrMo5, near)AISI 4118 (near)JIS SCM415 (JIS G4053)

SCM420

SCM420 is the 0.20% carbon Cr-Mo carburizing steel of JIS G4053 (AISI 4120 class) — the standard Japanese grade for medi…

DIN 20CrMo4 type (near)AISI 4120 (near)JIS SCM420 (JIS G4053)

SCM430

SCM430 is the JIS G4053 chromium-molybdenum machine structural steel corresponding to AISI 4130, with a slightly higher …

DIN 25CrMo4 / 1.7218 (near)AISI 4130JIS SCM430 (JIS G4053)

SCM435

SCM435 is the JIS Cr-Mo through-hardening steel matching AISI 4135 and EN 34CrMo4 — one step below SCM440/4140 in carbon…

DIN 1.7220 (34CrMo4)AISI 4135JIS SCM435 (JIS G4053)

SCM440

SCM440 is the JIS Cr-Mo steel matching 4140/42CrMo4 — the designation on Japanese, Korean and Taiwanese certificates for…

DIN 1.7225 (42CrMo4)AISI 4140JIS SCM440

SCr420

SCr420 is the chromium-only carburizing steel of JIS G4053, the Japanese counterpart of AISI 5120. Without molybdenum it…

DIN 1.7027 (20Cr4, near)AISI 5120JIS SCr420 (JIS G4053)

SCr440

SCr440 is the JIS designation of the 5140/40Cr chromium through-hardening steel — the designation on Japanese, Korean an…

DIN 1.7035 (41Cr4)AISI 5140JIS SCr440 (JIS G4053)

SNCM220

SNCM220 is the JIS Ni-Cr-Mo carburizing steel — the exact JIS designation of the AISI 8620 gear steel concept, and also …

DIN 1.6523 (21NiCrMo2-2, near)AISI 8620JIS SNCM220 (JIS G4053)

SNCM439

SNCM439 is the JIS designation of the 4340 Ni-Cr-Mo through-hardening steel — deep hardenability and high fatigue streng…

DIN 1.6511 (36CrNiMo4)AISI 4340JIS SNCM439 (JIS G4053)