ASTM1020/1035/1045/4140 ST52 27SiMn 41Cr4 Heavy Wallthickness Seamless Steel Pipe

Short Description:

Heavy wall seamless steel pipe is a type of pipe with higher wall thicknesses than average. 


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Product Introduction

Heavy wall seamless steel pipe is a type of pipe with higher wall thicknesses than average. The manufacturing process of heavy wall steel seamless pipe can be divided into four basic methods: cold drawn, cold rolled, hot rolled, and hot expansion. According to the purpose, it can be divided into seamless steel pipe for structure; seamless steel pipe for liquid transport; high-pressure seamless steel pipe for boiler; high pressure seamless steel pipe for fertilizer equipment; seamless steel pipe for geological drilling; seamless steel pipe for oil drilling; seamless steel pipe for oil cracking; seamless steel pipe for shipbuilding; various alloy pipes. Seamless steel pipes are indicated by outer diameter and wall thickness. 

Chemical Composition

Steel Grade

C

Si

Mn

S

P

Cr

Ni

Cu

Mo

ASTM1020

0.17~0.23

0.17~0.37

0.35~0.65

≤0.035

≤0.035

≤0.25

≤0.30

≤0.25

 

ASTM1035

0.32~0.39

0.17~0.37

0.50~0.80

≤0.035

≤0.035

≤0.25

≤0.30

≤0.25

 

ASTM1045

0.42~0.50

0.17~0.37

0.50~0.80

≤0.035

≤0.035

≤0.25

≤0.25

≤0.25

 

ASTM4140

0.38~0.45

0.17~0.37

0.50~0.80

≤0.035

≤0.035

0.90~1.20

≤0.30

≤0.30

0.15~0.25

ST52

0.12~0.20

0.20~0.55

1.20~1.60

≤0.035

≤0.035

≤0.25

≤0.25

≤0.25

 

27SiMn

0.24~0.32

1.10~1.40

1.10~1.40

≤0.035

≤0.035

≤0.30

≤0.30

 

≤0.15

41Cr4

0.37~0.44

0.17~0.37

0.50~0.80

≤0.035

≤0.035

0.80~1.10

≤0.30

≤0.25

≤0.10

 

Mechanical Properties

Steel Grade

Tensile Strength σb (MPa)

Yield Strength σs (MPa)

Elongation δ5 (%)

Impact energy  Akv (J)

Shrinkage of section ψ (%)

Impact toughness value   αkv (J/cm2)

Hardness HB

ASTM1020

≥410

≥245

≥25

 

≥55

 

≤156

ASTM1035

≥530(54)

≥315(32)

≥20

≥55

≥45

≥69(7)

≤197

ASTM1045

≥600

≥355

≥16

≥39

≥40

≥49(5)

≤229

ASTM4140

≥1080(110)

≥930(95)

≥12

≥63

≥45

≥78(8)

≤217

ST52

≥490

≥345

≥21

≥31

 

 

121~178

27SiMn

≥980

≥835

≥12

≥39

≥40

 

≤217

41Cr4

≥810

≥785

≥9

≥47

≥45

 

≤207

Production Process

Round tube billet → heating → piercing → three-roll cross rolling, continuous rolling or extrusion → stripping → sizing (or reducing diameter) → cooling → straightening → hydraulic test (or flaw detection) → marking → warehousing.

Application Field

Heavy wall seamless steel pipe are mainly used in water conservancy, petrochemical, chemical, electric power, agricultural irrigation, urban construction and other industries. For liquid transport: water supply and drainage. Gas transportation: natural gas, steam, liquefied petroleum gas. Structural uses: used as bridge piling pipes; docks, roads, buildings and other structures.


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