Carbon and low-alloy steels
Iron-carbon steels, with or without chromium, molybdenum, nickel and vanadium, for flanges, shafts, gears and pressure forgings: from A105 for piping to the Cr-Mo F22 and F91 used in refineries.
Carbon and low-alloy steels: alloys supplied by Dustre
Forms: Bar, Pipe, Forging and flange, Casting, Fitting, Plate. Click an alloy to see standards by form, composition, properties and equivalents.
| Material | UNS | W.Nr. / EN | Forms |
|---|---|---|---|
| 300M steel (modified 4340)Alloy steel · Ultra-high-strength low-alloy steel: 4340 with silicon and vanadium | K44220 | Sem equivalente EN direto | Bar, Pipe, Forging and flange, Casting |
| 8550 steel – 34CrAlNi7-10 (W.Nr. 1.8550)Alloy steel · Cr-Al-Ni-Mo nitriding steel | Sem UNS | 1.8550 | Bar, Forging and flange |
| ASTM A105 – Forged carbon steel for pipingCarbon steel · Carbon-manganese steel for forged flanges, fittings and valves | K03504 | ≈ P250GH | Bar, Pipe, Forging and flange, Fitting |
| ASTM A182 F1Alloy steel · Forged carbon-molybdenum (C-½Mo) steel for elevated temperature | K12822 | ≈ 16Mo3 | Plate, Pipe, Forging and flange, Fitting, Casting |
| ASTM A182 F5Alloy steel · Forged 5Cr-½Mo steel for high temperature and sulfidizing media | K41545 | X16CrMo5-1 | Bar, Plate, Pipe, Forging and flange, Fitting, Casting |
| ASTM A182 F9Alloy steel · Forged 9Cr-1Mo steel for high temperature and sulfidizing media | K90941 | X11CrMo9-1 | Plate, Pipe, Forging and flange, Fitting, Casting |
| ASTM A182 F11 Class 2Alloy steel · Forged 1¼Cr-½Mo steel for steam and elevated temperature | K11572 | ≈ 13CrMo4-5 | Plate, Pipe, Forging and flange, Fitting, Casting |
| ASTM A182 F22 / P22 (2¼Cr-1Mo)Cr-Mo alloy steel · All standards by product form | K21590 | 1.7380 10CrMo9-10 | Bar, Plate, Pipe, Forging and flange, Fitting, Casting |
| ASTM A182 F91 Type 1Alloy steel · Modified 9Cr-1Mo-V-Nb ("P91") steel for creep | K90901 | X10CrMoVNb9-1 | Plate, Pipe, Forging and flange, Fitting, Casting |
| ASTM A522 Type I – 9% Ni steelAlloy steel · Forged 9% nickel ferritic steel for cryogenic service down to −196 °C | K81340 | X8Ni9 | Bar, Plate, Pipe, Forging and flange, Fitting |
| ASTM A694 F65 – High-yield steel forgingCarbon steel · Forged carbon steel for high-pressure pipeline flanges and fittings | — | — | Pipe, Forging and flange, Fitting |
| SAE 4140Alloy steel · Chromium-molybdenum low-alloy steel for quenching and tempering | G41400 | 42CrMo4 | Bar, Plate, Pipe, Forging and flange |
| SAE 4340Alloy steel · High-hardenability nickel-chromium-molybdenum low-alloy steel | G43400 | ≈ 34CrNiMo6 | Bar, Plate, Pipe, Forging and flange |
| SAE 9315 – AMS 6263Alloy steel · High-hardenability Ni-Cr-Mo carburizing steel | G93150 | ≈ 15NiCr13 | Bar, Pipe, Forging and flange |
Did not find the alloy? See all materials or ask the technical team.
About carbon and low-alloy steels
The group covers three uses. Piping and pressure: ASTM A105 for flanges, fittings and valves. Mechanical engineering: quenched and tempered 4140 and 4340 for shafts, pins and gears, 9315 for carburizing and 8550 (34CrAlNi7-10) for nitriding. High temperature and hydrogen: the Cr-Mo grades F1, F11, F22, F5, F9 and F91, which keep creep strength in refineries and boilers. A522 Type I (9 % Ni) serves cryogenic service.
Heat treatment is what separates the applications: normalizing for A105, quenching and tempering for 4140 and 4340, normalizing and tempering for Cr-Mo. In welding, the carbon equivalent indicates the need for preheating and post-weld heat treatment.
See also
Frequently asked questions
What is the difference between carbon steel and low-alloy steel?
Carbon steel has carbon, manganese and silicon as its main elements. Low-alloy steel receives small amounts of chromium, molybdenum, nickel or vanadium to gain hardenability, toughness or high-temperature strength.
Which steel to use above 425 °C?
Carbon steel loses creep strength above about 425 °C. From there on, Cr-Mo steels take over: F11 and F22 in the intermediate ranges and F91 at the highest temperatures of boilers and refineries.
