B140H1 cold rolled coils

Bake hardening steel (BH steel) refers to steel added with some solid solution carbon atoms by adoption of special chemical compositions and production process. It is a new type of high-efficient automotive steel plates with relative low yield strength at delivery and increased yield strength by certain extents through coating baking after their draw forming. China special steel limited can provide two kind of BH steel, i.e. low carbon BH steel and ultra-low carbon BH steel, and B140H1 high-strength bake hardening steel is featured with good formability and stable bake hardness(BH value). They are widely used for manufacturing cover plates of automobiles such as outside door plates and engine hood plates.

B140H1 high-strength bake hardening steel product sizes:
Nominal thickness: 0.45mm~2.0mm, nominal width: 800mm~1850mm

B140H1 high-strength bake hardening steel mechanical performances:

Steel Grade	Yield strengtha MPa	Tensile strength Mpa ≥	After Breakage Percent Elongation (L0=50mm, b=25mm)%≥	After Breakage Percent Elongation (L0=80mm, b=20mm)%≥	rc ≥	nc ≥	Bake hardnessd(BH Value)Mpa ≥
B140H1	140~230	270	41	-	1.6	0.20	30

taking RP0.2 in case of indistinct yield, otherwise ReL

using P14 sample of GB/T228

c. r=(r90+2r45+r0)/4; n= (n90 +2n45+n0)/4.

d. the user is ss

B140H1 high-strength bake hardening steel tensile strain mark:

It is guaranteed that no tensile strain mark occurs on B140H1 high-strength bake hardening steel plates and strips at their application within 3 months after they are produced and in case of room temperature storage. However, the user is suggested to use BH steel as soon as possible because they tend to gaining tensile strain marks.

B140H1 high-strength bake hardening steel surface quality:

Grade	Code No.	Features
Relatively high-grade finishing surface	FB(O3)	It is allowed for the existence of a few surface defects which will not affect forming and coating & plating adhesiveness such as minor scratch, impression, pit, roll mark and oxidation tint.
High-grade finishing surface	FC(O4)	One side of relatively good quality is free from any remarkable defect visible and the other side must reach FB requirement s at least.
Ultra high-grade finishing grade	FD(O5)	One side of relatively good quality is free from any defect, namely appearance quality after painting or electrogalvanizing is not affected, and the other side must reach FB requirement at least.

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