GB28884 ท่อเหล็กไม่มีตะเข็บสำหรับถังแก๊สขนาดใหญ่

No.

Grade

Group

Chemical component,%

C

Si

Mn

P

S

Cr

Mo

Ni

Cu

1

30CrMoE

1^a

0.25~

0.35

0.15~

0.35

0.40~

0.90

≤0.020

≤0.010

0.80~

1.10

0.15~

0.25

≤0.30

≤0.20

2

2

0.26~

0.34

0.17~

0.37

0.40~

0.70

≤0.020

≤0.010

0.80~

1.10

0.15~

0.25

≤0.30

≤0.20

3

42CrMoE

1^b

0.40~

0.45

0.15~

0.35

0.75~

1.00

≤0.020

≤0.010

0.80~

1.10

0.15~

0.25

≤0.30

≤0.20

4

2

0.38~

0.45

0.17~

0.37

0.50~

0.80

≤0.020

≤0.010

0.90~

1.20

0.15~

0.25

≤0.30

≤0.20

^a Grade30CrMoE group1 is equivalent to 4130X.

^bGrade42CrMoE group1 is equivalent to 4142

Grade

Tensile Strength

R^a MPa

Lower yield strength or specified plasticity elongation

ReL or R_p0.2^a MPa

 percentage elongation after fracture

A_50mm^a%

yield ratio

(R_eL/R_a or R_p0.2/R_a)%

Hardness

HBW

-10^oCShock absorption energy KV₂J

Average

A single sample

30CrMoE^b

≥720

≥485

≥20

≤86

≤269

≥40

≥32

42CrMoE^c

≥930

≥760

≥16

-

≤330

≥40

≥32

^b 30CrMoE mechanical property is equivanlent to 4130X

^c 42CrMoE mechanical property is equivanlent to 4142