Ordinary carbon structural steel

Ordinary carbon structural steel is also called ordinary carbon steel. The carbon content is 0.06-0.22%, with less than 0.25% being the most commonly used. Belonging to low carbon steel, each metal grade represents the lowest yield point of the steel when the thickness is less than 16mm.

Ordinary carbon structural steels have wide limits on carbon content, property range and content of phosphorus, sulfur and other residual elements.

The main grades of ordinary carbon structural steel are:
ASTM Standards: A36, A283 Grade C, A514 Grade B, A514 Grade P, A514 Grade Q, A572 Grade 50, A572 Grade 60, A588 Grade A, A573 Grade 70, A588 Grade B, A633 Grade C, A709 Grade 50, A709 Grade 50W
ASME standard: SA36,SA283 Grade C,SA572 Grade 50,SA573 Grade 70, SA514 Grade B,SA514 Grade P,SA514 Grade Q,SA588 Grade A,SA588 Grade B, SA633 Grade C, SA709 Grade 50, SA709 Grade 50W
EN10025-2 standard: S235JR, S355JR, S355J2, S275JR, S355J0, S275J0, S275J2,
EN10025-3 Standard: S355N, S355NL, S275N, S275NL, S420N, S420NL, S460N, S460NL,
EN10025-4 standard: S420ML, S355ML, S460ML
EN10025-6 standard: S690QL, S460QL, S460QL1, S960Q, S960QL
JIS standard: SS400, SM490YA, SM490YB, SM570,
DIN standard: St37-2, St52-3
GB/T700 standard: Q235A, Q235B, Q235C, Q235D, Q275
GB/T1591 standard: Q345B, Q345C, Q345D, Q460D

Ordinary carbon structural steel is divided into three categories:
Class A steel (Class A steel) is the steel that guarantees mechanical properties;
Type B steel (Type B steel) is the steel with guaranteed chemical composition;
Special steel (C-type steel) is a steel that guarantees both mechanical properties and chemical composition.

According to some special performance requirements, the composition of ordinary carbon structural steel can be slightly adjusted to form a series of professional steels, such as riveting steel, bridge steel, pressure vessel steel, hull steel, boiler steel.

In addition to strictly controlling chemical composition and ensuring conventional performance, professional steel also stipulates some special inspection items, such as low temperature impact toughness, aging sensitivity, gas in steel, inclusions and fractures.

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