What is the SAPH400 steel?

Q/BQB 310-2009 SAPH400 steel description

Standard: Q/BQB 310-2009

Grade: SAPH400

Category: cold forming automobile structural steel

SAPH400 steel chemical composition:

Carbon: ≤0.21, Silicon: ≤0.30, Manganese: ≤1.40, Phosphorus: ≤0.030, Sulfur: ≤0.025

SAPH400 steel mechanical properties

Tensile strength: ≥400Mpa

Yield strength: ≥255Mpa

Elongation: ≥31%

Surface classification:

Normal surface (FA)

Pickled surface or rolled surface

The surface is allowed to have slight and local defects such as pitting, concave surface, scratches, etc., whose depth (or height) does not exceed half of the thickness tolerance of the steel plate, but the allowable small thickness of the steel plate and steel strip should be ensured.

SAPH400 cold forming steel is used for automotive structural parts such as automobile frames and wheels that require forming performance.