ASTMA333 low temperature steel pipe

 There are 9 grades of cryogenic pipes under the ASTM A333 standard, which are often used for -45℃～-195℃ cryogenic pressure vessel pipes or seamless steel pipes for cryogenic heat exchangers.

Chemical composition content of different grades

Standard

Grade

Chemical Composition (%)

C

Si

Mn

P

S

Cr

Ni

Cu

Mo

V

Al

ASTM A333

Grade 1

≤0.30

0.40~1.06

≤0.025

≤0.025

Grade 3

≤0.19

0.18~0.37

0.31~0.64

≤0.025

≤0.025

3.18~3.82

Grade 4

≤0.12

0.18~0.37

0.50~1.05

≤0.025

≤0.025

0.44~1.01

0.47~0.98

0.40~0.75

0.04~0.30

Grade 6

≤0.30

≥0.10

0.29~1.06

≤0.025

≤0.025

Grade 7

≤0.19

0.13~0.32

≤0.90

≤0.025

≤0.025

2.03~2.57

Grade 8

≤0.13

0.13~0.32

≤0.90

≤0.025

≤0.025

8.40~9.60

Grade 9

≤0.20

0.40~1.06

≤0.025

≤0.025

1.60~2.24

0.75~1.25

Grade 10

≤0.20

0.10~0.35

1.15~1.50

≤0.03

≤0.015

≤0.15

≤0.25

≤0.015

≤0.50

≤0.12

≤0.06

Grade 11

≤0.10

≤0.35

≤0.6

≤0.025

≤0.025

≤0.50

35.0~37.0

≤0.50

Mechanical properties analysis of different grades

Standard	Grade	Tensile Strength (MPa)	Yield Point (MPa)	Elongation (%)
				Y	X
ASTM A333	Grade 1	≥380	≥205	≥35	≥25
	Grade 3	≥450	≥240	≥30	≥20
	Grade 4	≥415	≥240	≥30	≥16.5
	Grade 6	≥415	≥240	≥30	≥16.5
	Grade 7	≥450	≥240	≥30	≥22
	Grade 8	≥690	≥515	≥22
	Grade 9	≥435	≥315	≥28
	Grade 10	≥550	≥450	≥22
	Grade 11	≥450	≥240	≥18

ASTMA333 standard low temperature steel pipe usually has two production methods: cold rolling and hot rolling. It adopts seamless or welding manufacturing process. ASTMA333 standard low temperature steel pipe has better mechanical properties and low price, so it is widely used. The biggest weakness of these pipes is that the hardenability is low, and the workpieces with large cross-sectional dimensions and relatively high requirements should not be used.

From:http://boilersteelpipe.com/pro/smls/astma333-low-temperature-steel-pipe.html