Round Cold Drawn Seamless Steel Tube

Product name Round Cold Drawn Seamless Steel Tube ASTM A106Carbon and Alloy
Steel pipe
Material Carbon Steel/ non-Alloy Steel
Section Shape Round
Grade #(St37.4,St35,St37,E235),20#(St45,St44,E255),
45#(Ck45),16Mn(St52) and other special material.
Usage For manufacture of pipelines, vessels, equipment, pipe
fitting and steel structure
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Product Details

Product Details


-The round cold drawn seamless steel tube is manufactured from carbon and alloy steels for structural  or other mechanical purposes involving machining or heat treating, such as  close tolerances, smooth finish, or definite physical properties.

-Designed with strong frame with high strength, it is study enough to support the pipe with stable operation. And it has the resistance to oxygen, corruption, water and dust, which is also available to withstand the high temperature.

-Adopting the round shape, it is available to allow the liquid pass through with large capacity which is quite efficient. And it is convenient to process with simple operation and high working efficiency.

-With the good treatment, it has smooth surface as well as light weight, which is easy to move and transport, greatly reducing the cost of transportation.

-The round cold drawn seamless steel tube has guaranteed quality, endurable service life and outstanding performance, which is a good solution for the industrial application.


Brief Introduction

Round Cold Drawn Seamless Steel Tube


Product Specification

Product

Round ColdDrawn Seamless Steel Tube ASTM A106 Carbon and Alloy Steel pipe

Material

Carbon Steel/ non-Alloy Steel

Section Shape

Round

Grade

10#(St37.4,St35,St37,E235),20#(St45,St44,E255),45#(Ck45),16Mn(St52) and other special material.

Standard

DIN2391,EN10305-1,GB/T3639

Certification

ISO9001

Technique

Cold rolled & Cold drawn

Application

Widely used in automobiles, motorcycles, gas springs, hydraulic machinery,
 construction machinery and refrigeration industry.

Supply Status

BK, BKS, BKW,NBK, GBK

Package

Wrap in bundles with plastic woven bags

Trade Terms

T/T L/C

Delivery Time 

In time

Chemical composition of Material

Steel grade

Chemical composition,%

C

Si

Mn

P

S

Cr

St45 (20#)

0.17-0.24

0.17-0.37

0.35-0.65

0.035

0.035

0.25

ST52(E355)

≤0.22

≤0.55

≤1.6

0.025

0.025

0.25

SAE1026

0.22-0.28

0.15-0.35

0.6-0.9

0.04

0.05

/

STKM 13C

≤0.25

≤0.35

0.3-0.9

0.04

0.04

/

Q345B

≤0.2

≤0.5

1.0-1.6

0.03

0.03

0.30

CK45

0.42-0.50

0.17-0.37

0.5-0.8

0.035

0.035

0.25

Mechanical Property of Material

Delivery condition

cold finished(hard)(BK)

Cold drawn andstress-relieved(BK+S)

Steel grade

Rm MPa

Elongation
 A5(%)

Rm MPa

ReH MPa

Elonggation
 A5(%)

St45

≥550

≥5

≥520

≥375

≥15

20#

≥550

≥8

≥520

≥375

≥15

St52 (E355)

≥640

≥5

≥600

≥520

≥14

SAE1026

≥640

≥5

≥600

≥510

≥15

STKM 13C

≥550

≥8

≥520

≥375

≥15

Q345B

≥640

≥5

≥600

≥520

≥14

CK45

≥640

≥5

≥600

≥520

≥10


COMPARATIVE DATA
 SEAMLESS CARBON STEELS

Condition

Nominal
 Yield
Strength
psi

Nominal
 Ultimate
Strength
psi

Nominal
 Elongation
 in 2%

Equivalent
 Rockwell
 Hardness

Equivalent
Brinell
Hardness

GRADE 1018
c .15/.20 Mn .60/90 P .40 max S.050 max

Hot-Rolled

 35,000

60,000

30

B-68

116

Normalized

 38,000

58,000

35

B-66

114

Soft-Annealed

 33,000

50,000

40

B-57

 97

As-Drawn

 70,000

85,000

10

B-87

170

CD-StressRelief Annealed

 60,000

80,000

15

B-85

163



GRADE 1020
C. 18/.23 Mn .30/.60 P .040 max S .050 max

Hot-Rolled

 38,000

60,000

30

B-68

116

Normalized

 40,000

58,000

35

B-66

114

Soft-Annealed

 33,000

53,000

40

B-62

105

As-Drawn

 65,000

80,000

10

B-85

163

CD-StressRelief Annealed

 60,000

75,000

15

B-81

149





Cold Drawn Seamless Tube

Cold drew seamless steel tube with defect classificationBasic knowledge of causes


I.    abrasion:Characteristics: the steel tube surface presents the length is not identical, the direction is indefinite does not have the rule the scratch, generally assumes the straight line shape, can see its bottom.

II. Causes: 1) improper operation during annealing;2) scratch during lifting;3) during the straightening process, the steel pipe is grazed at the sleeve.

2.Marking (also called drawing, drawing, straightening including blue line)Features: the inner and outer surface of the steel tube presents longitudinal straight lines with different lengths, and the outer surface is furrowed with the visible bottom. The surface has damaged inner lines, and the surface has no damage to straight lines.

Causes: 1) drawing on the capillary;2) there is a residual iron oxide scale on the capillary;3) bad lubricant coating, causing increased friction, resulting in mold hair

Hot metal;4) insufficient or uneven hardness of internal and external molds, poor finish;5) poor hammerhead, sharp edges, and corners in the transition part, mold wear, resulting in scratches.

3.Jutter:Features: on the inner and outer surface of the steel tube, the whole or half ring of corrugated ring marks are uneven along the length direction, and they are arranged one by one, some are continuous, some are intermittent. Commonly caused by pull-out jitter (called "shooting machine gun").

Causes: 1) unwashed during pickling, poor lubrication, uneven coating;2) uneven annealing performance, excessive tensile strength, high carbon content of hot rolled steel pipe cooling speed is too large, resulting in steel is hard, processing hardening;3) the pipe is too large with no gap in the head and poor saponification;4) the mandrel is fine, and elastic deformation of the mandrel occurs during drawing, causing vibration;5) too fast starting speed during drawing, or chain vibration during opening and pulling;6) unreasonable die matching, too large inlet cone Angle, small contact area between pipe and die hole, or improper location of mold diameter, unsteady deformation, and surface jitter during drawing.

Four.Pits (including indentation) :Characteristics: the surface of the steel tube is not the same area of local sag, some cyclical, and some irregular. Defect surface is broken pit, the surface is not broken indentation.





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