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ISO/TR 15608 ISO/TR 15608 Material Group 11.2

ISO/TR 15608 Material Group 11.2: Carbon steels with higher carbon (0,35 ≤ C ≤ 0,50% c) and with following analysis:

Si ≤ 0,60%; Mn ≤ 1,8%; Mo ≤ 0,70%c; S ≤ 0,045%; P ≤ 0,045%; Cu ≤ 0,40%c; Ni ≤ 0,5%c; Cr ≤ 0,3%; (0,4% for castings; Nb ≤0,06%; V ≤ 0,1%c; Ti ≤0,05%;

Remarks:
c A higher value is accepted, provided Cr+Mo+Ni+Cu+V ≤ 1,00%

Steels acc. ISO/TR 15608 Material Group 11.2 with higher content if Carbon

Carbon steels are commonly used in the manufacturing of many products and structures due to its high strength and low cost. Steels with higher carbon contents generally also contain other strength-enhancing elements, such as manganese.

What is the effect of carbon content on carbon steel?

Carbon is the most important factor in determining the mechanical properties of steel. As the carbon content increases, hardness increases, while plasticity and toughness decrease. Weldability also decreases with increasing carbon content due to martensite formation, especially with a carbon content of over 0.25 %. Steels are at risk of cracking during welding if martensite forms in the heat-affected zone (HAZ) due to rapid cooling.

The carbon equivalent (CE) when welding steels with a higher carbon content

The decisive factor for good weldability is the carbon equivalent (CE), which can be calculated using the formula: CEV=C+Mn/6+(Cr+Mo+V)/5, +(Ni+Cu)/15. The carbon equivalent (CE) in steels is a numerical value used to assess the weldability and hardenability of a specific steel composition. The carbon equivalent is especially important in welding applications because it helps estimate the risk of cracking in the heat-affected zone (HAZ) of a weld joint and can help to determine the preheating temperature.

NameNumberStandardProductRemarks
C45E1.1191EN 10269FastenersEN 13445-2 &EN 13480-2
WP1K12821ASTM A-234FittingASME BPVC
K03300ASTM A-455PlateASME BPVC
3K05001ASTM A-266ForgingASME BPVC
Table: Typical materials