Carbon steel castings are, as you might expect, characterised by their high carbon composition which delivers a high strength, toughened steel for use in high pressure conditions. Carbon steel can withstand high stresses and, as such, is ideal for mechanical and structural applications.

The low and medium carbon alloy steels contain varying amounts of nickel, chromium or molybdenum to enhance their durability and toughness, as well as their resistance to corrosion.

Carbon steel grades & compositions

  • Carbon Steel
  • Low and Medium Alloy Steel
  • Austenitic Manganese
CARBON STEEL NOMINAL COMPOSITION
GRADE C SI MN CR MO NI CU NB V FE W CO N
ASTM A216 WCA 0.25 0.6 0.7
ASTM A216 WCB 0.3 0.6 1
ASTM A216 WCC 0.25 0.6 1.2
BS 3100A1 0.25 0.6 0.9
BS EN 10213 GP240GH (1.0619) 0.25 0.6 0.9
BS 3100A2 0.35 0.6 1
BS EN 10213 GP280GH (1.0625) 0.35 0.6 1
BS 3100A3 0.45 0.6 1
BS EN 10213 G17Mn5 (1.1131) 0.45 0.6 1
BS 3100A4 0.2 0.6 1.3
BS EN 10213 G20Mn5 (1.6220) 0.2 0.6 1.3
BS 3100A5 0.29 0.6 1.3
BS 3100A6 0.29 0.6 1.3
BS3100 BW2 0.55 0.75 0.75 1.2 0.4
LOW/MEDIUM ALLOY NOMINAL COMPOSITION
GRADE C SI MN CR MO NI CU NB V FE W CO N
ASTM A217 C12 0.2 1 0.45 9 1
ASTM A217 C12A 0.1 0.35 0.45 9 0.9 0.4 0.07 0.02 0.05
ASTM A217 C5 0.2 0.75 0.55 5.5 0.55
10213 G17CrMo5-5 1.7357 0.2 0.75 0.55 5.5 0.55
ASTM A217 WC6 1.5 0.6 0.7 1.3 0.55
ASTM A217 WC9 1.5 0.6 0.3 2.2 1.05
ASTM A352 LC3 0.15 0.6 0.65 3.5
ASTM A352 LCA 0.25 0.6 0.7 0.5 0.2 0.5 0.3 0.03
ASTM A352 LCB 0.3 0.6 1 0.5 0.2 0.5 0.3 0.03
ASTM A352 LCC 0.25 0.6 1.2 0.5 0.2 0.5 0.03
ASTM A487 10 CLASS A 0.3 0.8 0.8 0.75 0.3 1.8
ASTM A487 4B 0.3 0.8 1 0.6 0.2 0.6 0.5 0.03 0.1
ASTM A487 1C 0.3 0.8 1 0.1
BS 3100 B4 0.25 0.75 0.5 3 0.45 0.4 0.3
BS 3100 BT1/BT2/BT3 SUPPLIED TO SPECIFIED MECHANICAL PROPERTIES ONLY