Structural steel
Alloy structural steel
Chromium, molybdenum and nickel give hardenability that non-alloy carbon steel does not have in heavy cross-sections. We supply alloy round bar and bar in quenched and tempered steel (chromium-molybdenum steel such as 42CrMo4 / 1.7225 and chromium-nickel-molybdenum steel such as 34CrNiMo6 / 1.6582 and 30CrNiMo8 / 1.6580), case-hardening steel (16MnCr5, 18CrNiMo7-6 and chromium-nickel steel such as 15CrNi6 / 17CrNi6-6) and nitriding steel. Cut to length with EN 10204/3.1.
Types we supply
Grade, W.Nr., condition and standard. We source the bars from European mills and cut to your length with EN 10204/3.1. Canonical material pages: 42CrMo4 / 1.7225 · 42CrMoS4 / 1.7227 · 34CrNiMo6 / 1.6582 · 16MnCr5 / 1.7131.
- 25CrMoS4 · 1.7213: +QT · EN 10083 · 25CrMo4 / S4
- 34CrMo4 · 1.7220: +QT · EN 10083 · 34CrMo4 / S4
- 42CrMoS4 · 1.7227: +QT · EN 10083 · 42CrMo4 / S4 · AISI 4140
- 30CrNiMo8 · 1.6580: +QT · EN 10083 · Supplied +QT
- 34CrNiMo6 · 1.6582: +QT · EN 10083 · Supplied +QT
- 15CrNi6 · 1.5919: +A · EN 10084 · Supplied +A
- 17CrNi6-6 · 1.5918: +A · EN 10084 · Supplied +A
- 16MnCrS5 · 1.7139: case hardening · EN 10084 · 16MnCr5 / S5
- 20MnCrS5 · 1.7149: case hardening · EN 10084 · 20MnCr5 / S5
- 18CrNiMo7-6 · 1.6587: +FP / +TH · EN 10084 · Supplied +FP/+TH
- 31CrMoV9 · 1.8519: +QT · EN 10085 · Nitriding steel +QT
- 34CrAlNi7-10 · 1.8550: +QT · EN 10085 · Nitriding steel +QT
Chromium-molybdenum, chromium-nickel and CrNiMo – how the families differ
Searches for ‘chromium nickel steel’, ‘nickel chromium steel’ and ‘CrNiMo steel’ in practice cover four technically different material groups, which must not be confused when ordering:
- Chromium-molybdenum quenched and tempered steel (CrMo, EN 10083-3): 42CrMo4 (1.7225), 42CrMoS4 (1.7227), 34CrMo4 (1.7220) and 25CrMo4 (1.7218) – the standard choice for quenched and tempered (+QT) shafts and machine parts in moderate cross-sections.
- Chromium-nickel-molybdenum quenched and tempered steel (CrNiMo, EN 10083-3): 34CrNiMo6 (1.6582) and 30CrNiMo8 (1.6580) – Q&T steel with nickel content for large cross-sections where through-hardening and high core toughness are required.
- Chromium-nickel and CrNiMo case-hardening steel (EN 10084): 15CrNi6 (1.5919), 17CrNi6-6 (1.5918) and 18CrNiMo7-6 (1.6587) – low-carbon steel for carburising (case hardening) of gears and crown wheels.
- Stainless chromium-nickel steel (EN 10088): 1.4301 (304) and 1.4404 (316L) – corrosion-resistant austenitic steels with ≥ 10.5 % Cr, which belong under stainless steel and are not Q&T or case-hardening steels.
Alloy engineering steel
- 16MnCr5 / 1.7131
- 16MnCrS5 / 1.7139
- 20MnCr5 / 1.7147
- 20MnCrB5 / 1.7168
- 19MnV6 / 1.5217
- 42CrMo4 / 1.7225
- 25CrMo4 / 1.7218
- 34CrMo4 / 1.7220
- 34CrNiMo6 / 1.6582
- 30CrNiMo8 / 1.6580
- 51CrV4 / 1.8159
- 56Si7 / 1.5026
- 51Si7 / 1.5025
- 65Si7 / 1.5028
- 50Mn7 / 1.0913
- 61SiCr7 / 1.7108
- 67SiCr5 / 1.7103
- 55Cr3 / 1.7176
- 58CrV4 / 1.8161
- 52CrMoV4 / 1.7701
- 41Cr4 / 1.7035
- 34Cr4 / 1.7033
- 24CrMo5 / 1.7258
- 50CrMo4 / 1.7228
- 100Cr6 / 1.3505
- 100CrMo7-3 / 1.3536
- 15CrNi6 / 1.5919
- 17CrNi6-6 / 1.5918
- 18CrNi8 / 1.5920
- 18CrNiMo7-6 / 1.6587
- 23CrMoB3-3 / 1.7271
- 15NiCr13 / 1.5752
- 31CrMoV9 / 1.8519
- 34CrAlNi7-10 / 1.8550
- 37MnSi5 / 1.5122
- 35NiCrMoV5-12 / 1.6959
- 36CrNiMo4 / 1.6511
- 40NiCrMo6 / 1.6565
- 36NiCrMo16 / 1.6773
- 4330V / 1.6932
- 33NiCrMoV14-5 / 1.6956
- 30CrMoV9 / 1.7707
- 20NiCrMo2-2 / 1.6523
- 1.8714
- X120Mn12 / 1.3401
- X2NiCoMo18-9-5 / 1.6554
- C67S / 1.1231
- 66Mn4 / 1.1260
- 74NiCr2 / 1.2703
- 100CrMnSi6-4 / 1.3520
- 100CrMnMoSi8-4-6 / 1.3539
- 46Si7 / 1.5024
- 42MnV7 / 1.5223
- 39NiCrMo3 / 1.6510
- 30NiCrMo2-2 / 1.6545
- 30NiCrMo16-6 / 1.6747
- 23MnNiMoCr6-4 / 1.6753
- 23MnNiMoCr5-4 / 1.6758
- 30 NiCrMoV 12 / 1.6949
- 27NiCrMoV15-6 / 1.6957
- 54SiCr6 / 1.7102
- 52SiCrNi5 / 1.7117
- 42CrMoS4 / 1.7227
- 40CrMoV4-6 / 1.7711
- 24CrMoV5-5 / 1.7733
- 15 CDV 6 / 1.7734
- 32CrMoV12-10 / 1.7765
- 21CrMoV5-11 / 1.8070
- 41CrAlMo7-10 / 1.8509
- 31CrMo12 / 1.8515
- E590K2
- S770QL
- S890QL1
- 20NiCrMoS2-2 / 1.6526
Frequently asked questions
- What does +QT mean on alloy steel?
- +QT is hardened and tempered (quenched and tempered). Strength and toughness are set at the mill. The same W.Nr. in Ø80 and Ø400 is not the same material – the core of the large bar takes hardening less well.
- What is the difference between chromium-nickel steel, CrNiMo steel and stainless Cr-Ni steel?
- In alloy structural steel, chromium-nickel steel covers case-hardening steels such as 15CrNi6 and 17CrNi6-6 (EN 10084), while chromium-nickel-molybdenum steel (CrNiMo) covers quenched and tempered steels such as 34CrNiMo6 and 30CrNiMo8 (EN 10083-3) and heavy case-hardening steels such as 18CrNiMo7-6. Stainless chromium-nickel steels such as 1.4301 (304) and 1.4404 (316L) have ≥ 10.5 % Cr for corrosion resistance and belong under stainless steel – not alloy structural steel.
- 42CrMoS4 or 42CrMo4?
- Same chromium-molybdenum framework. The S variant 42CrMoS4 (1.7227) has controlled sulphur for better machinability, while 42CrMo4 (1.7225) has the ordinary sulphur limit. We supply the variant the certificate has to carry.
- EN 10083, EN 10084 or EN 10085?
- EN 10083 is quenched and tempered steel (25CrMo4, 42CrMo4, 42CrMoS4, 34CrNiMo6, 30CrNiMo8). EN 10084 is case-hardening steel (15CrNi6, 17CrNi6-6, 16MnCr5, 16MnCrS5, 18CrNiMo7-6). EN 10085 is nitriding steel (31CrMoV9, 34CrAlNi7-10).
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Send grade and condition
Name or W.Nr., +AR / +N / +QT, diameter and length. We come back with mill and lead time.