ISO/TR 15608 Material Group 4.1: HSLA steel – Low vanadium alloyed Cr-Mo-(Ni) steels with Mo ≤ 0,7 %, V ≤ 0,1 %, Cr ≤ 0,3 % and Ni ≤ 0,7 %
Features of high strength low-allow steels (HSLA steel) material group 4.1
This group contain high strength low-alloy steels (HSLA) with specified yield strength (see below) with good toughness. High strength low-alloy steel provides better mechanical properties compared to carbon steels. Generally speaking, grain size is reduced to reduce pearlite structure, increasing the material’s yield strength. Typical elements that are added to achieve this are titanium, copper, niobium and vanadium. The carbon content of HSLA steel can be anywhere between 0.05 and 0.25% (in mass content) in order to retain formability and weldability. Other elements include, but are not limited to, nickel, chromium, molybdenum and calcium. However, as low-alloy steels, the combined amount of alloying elements (excluding carbon) does mostly not exceed the limit of 2% in mass content.
Typical applications of HSLA steel: Cryogenic fluid transportation or refrigeration systems.
Low vanadium alloyed Cr-Mo-(Ni) steels with higher content of chromium and nickel: see Group 4.2
Typical materials in group 4.1
| Name/Grade | Number | Standard | Product | Remarks |
|---|---|---|---|---|
| 10MnMoNi5-5 | 1.6308 | EN 10222-2 | Forging | EN 13445-2 & EN 13480-2 |
| 15MnCrMoNiV5-3 | 1.6920 | EN 10222-2 | Forging | EN 13445-2 & EN 13480-2 |
| 4 | K11267 | ASTM A-333 | Smls. & welded pipe | ASME BPVC |
| 3, Cl. 1 3, Cl. 2 | K12045 K12045 | ASTM A-541 ASTM A-541 | Forging Forging | ASME BPVC ASME BPVC |
| LF6, Cl. 2 E C | K12202 K12202 K12202 | ASTM A-350 ASTM A-633 ASTM A-737 | Forging Plate Plate | ASME BPVC ASME BPVC ASME BPVC |
| C | K12524 | ASTM A-225 | Plate | ASME BPVC |
| 8620 | G86200 | ASTM A-108 | Bar | ASME BPVC |