DIN2391 honed seamless steel pipe mill

Product Details

Product Name

DIN2391 honed seamless steel pipe mill


Product Specification

Outer diameter: 25mm -500mm 
Wall thickness: 2-50mm
Material: ST52, ST35, ST45
Standard: GB/T8713-88, GB/T3639-2009, DIN2391, EN10305

Honed tubes can be produced according to the demands of costumers that the degree of precision can reach H8/H9. Burnishing and honing service can be provided depending on the roughness requirement of inner diameter.

Product Application

Automotive and mechanical pipes    

Petroleum cracking pipes    

High Pressure Boiler Pipe    

Low and middle pressure fluid transportation pipeline    

Chemical fertilizer equipment pipes    

Heat exchanger pipes    

Low and middle pressure fluid transportation pipeline
Casing pipe

Low and medium pressure boiler seamless steel pipe

High pressure boiler seamless steel pipe

Carbon seamless steel pipe for ship
Seamless steel pipe used in high pressure chemical fertilizer equipment
Petroleum and natural gas industry
Steel pipe for Heat exchanger
Used for diesel engine
Chemical industry,building industry,environment industry etc.


Material & Chemical Composition:
DIN2391 standard ST52, EN10305 standard E355, 16Mn, ASTM A106B, C20/20#, CK45

Product Name

St35 steel 

pipe

St45 steel 

pipe

St55  

steel pipe

St52 steel 

pipe

chemical 

analysis

C:=0.18; 

P:=0.05; 

S:=0.05

C:=0.25; P:=0.05; 

S:=0.05

C˜0.36; P:=0.05; S:=0.05

C:=0.20; Si=0.55;Mn=1.5;

P:=0.05; S:=0.05

Tensile Strength

+NBK,35-45MPa; +BK,=45MPa;+BKW,

=38MPa;+GBK,=32MPa

+NBK,45-55MPa; +BK,=55MPa;+BKW,

=48MPa;+GBK,=40MPa

+NBK,55-65MPa; +BK,=65MPa; +GBK,=50MPa

+BK,=60MPa;

+BKW,=55MPa;

Yield strength

+NBK,=24M Pa

+NBK,=26MPa

+NBK,=30MPa

-

Standard

DIN2391-1

Length

As customer's request

Packaging

Standard export packing, packed in woven bags, with two nylon slings, or can be customized as request

Heat Treatment/      Delivery Condition

Cold finished (hard)   BK(+C)
Tubes do not undergo heat treatment following the final cold forming and, thus, have a rather high resistance to deformation
Cold finished (soft)  BKW(+LC)
The final heat treatment is followed by cold drawing involving limited deformation. Appropriate further processing allows a certain degree of cold forming (e.g. bending, expanding)
Cold finished and stress-relieved annealing BKS(+SR)
Heat treatment is applied following the last cold forming process. Subject to appropriate processing conditions, the increase in the residual stresses involved enables both forming and machining to a certain degree.
Annealed  GBK (+A)
The last Cold forming process is followed by annealing in a controlled atmosphere.
Normalized  NBK (+N)
The last cold forming process is followed by annealing above the upper transformation point in a controlled atmosphere.

Delivery Time

Within 35-50 days from receiving deposit

Payment Term

100% L/C at sight or 30% deposit, 70% balance against copy of B/L

Usage/Application

Pipes for automobile and motorcycle

Dimension tolerance:

Inner Dia (mm)

ID Tolerance (mm)

WT Tolerance (mm)

H7

H8

H9

H10

H11

30

+0.021/0

+0.038/0

+0.052/0

+0.084/0

+0.130/0

±5-10%

>30-50

+0.025/0

+0.039/0

+0.062/0

+0.100/0

+0.160/0

>50-80

+0.030/0

+0.046/0

+0.074/0

+0.120/0

+0.190/0

>80-120

+0.035/0

+0.054/0

+0.087/0

+0.140/0

+0.220/0

>120-180

+0.040/0

+0.063/0

+0.100/0

+0.160/0

+0.250/0

>180-250

+0.046/0

+0.072/0

+0.115/0

+0.185/0

+0.290/0

>250-315

+0.052/0

+0.081/0

+0.130/0

+0.210/0

+0.320/0

>315-400

+0.057/0

+0.089/0

+0.140/0

+0.230/0

+0.360/0

Product description

Processing Form

I. D

Length

Straightness

I. D Tolerance

I. D Roughness

Cold-rolled

30-100

= 12M

0.3-1.0

H8-H10

0.4-1.6

Cold-drawn

30-250

= 12M

0.3-1.0


0.8-1.6

Hone

40-500

= 12M

1000

H8-H9

0.4-0.8

SRB

40-400

= 7M

1000

H8-H9

0.1-0.4

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