Sunny Steel Enterprise Ltd.: Shanghai, China; Main products: alloy pipe, seamless tube, Anti-corrosion steel pipe, seamless pipes, Ceramic Lined Pipe, Ceramic tile lined pipe, Bi metal clad pipe, Ceramic sleeve lined Pipe, Lateral pipe Wye

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Home > Products > Seamless steel pipe > Seamless Precision steel tubes

Seamless Precision steel tubes

FOB Price

USD $1000 - $3000 / Ton

10 Tons(Min.Order)

Port Shanghai
Payment TermsT/T L/C D/P D/A
Delivery Detail30 days

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Product Details

Place of Origin	China	Thickness	5, 30
Application	Structure Pipe	Technique	Cold Drawn
Secondary Or Not	Non-secondary	Special Pipe	Thick Wall Pipe
Section Shape	Round	Outer Diameter	15, 300

Product Description

Sunny Steel offers an extensive range of seamless precision steel tubes. The seamless precision steel tubes can be used for a wide range of precision mechanical spare for car and cylinder accord to standard DIN2391/ EN10305-1/ GB/T3639-2009.
Double tubes, Double tubes Precision cold drawn seamless tube, Cold drawn tube Precision steel tubes, Precision steel tubes
 
Seamless Precision Steel Tubes according to EN 10305-1
Standard: Seamless Precision steel tubes, DIN2391 part 2 , DIN EN10305-1, DIN17175 etc;
Material: ST35,ST45,ST52.
Manufacturing method: cold-rolled / cold-drawn
Delivery condition: BK,BKS,SR,GBK,NBK.
 
Certificate
Factory Certification: 2.2 according to EN
Acceptance Test Certificate:3.1 according to EN 10204
 
Packing:
in bundles tied with steel strips. External packing by wooden cases if the wall thickness/OD ratio is low.
Oil-coating is generally necessary especially for export.
 
Application: 
Used in hydraulic & pneumatic cylinder ,automobile and other mechanical device .Feature: high precision and high brightness, the inner and outer surface of the tubes have high cleanness without oxid, mechanical properties of the final tubes also come out excellent, promising no leakage under high pressure, no deformation after cold-bent and no cracks when flaring and flattening, ensuring the efficient operation in all service.
NBK means protective heat-treating under the non-oxidation enviroment to get a bright and smooth surface for the tubes. 
DIN 2391-81 Part 2 Seamless Precision steel tubes(DIN2391-81)
Standard DIN 2391 defines the technical delivery conditions for seamless precision steel tubes according to DIN 2391 Part 1 which are made from the steel grades listed in section 5.
Tubes according to this Standard are mainly used where accuracy to dimension and, possibly, small wall thicknesses and good surface condition are required.
Chemical composition(%)
Code
number
Material number
Mfg. Process
C
max
Si
max
Mn
max
P
max
S
max
St35
1.0308
S
0.17
0.35
0.4
0.05
0.05
St45
1.0408
S
0.21
0.35
0.4
0.05
0.05
St52
1.0508
S
0.22
0.55
1.6
0.05
0.05
Mechanical and technological properties
Code number
Material number
Cold-finished hard(BK)
Cold-finished/soft (BKW) 3)
Rm(Mpa)
A(%)
Rm(Mpa)
A(%)
St 35/E235
1.0308
480
6
420
10
St 45
1.0408
580
5
520
8
St 52/E355
1.0508
640
4
580
7
Code number
Cold finished (soft)(BKW)
Annealed (GBK)
Normalized (NBK)
Rm(Mpa)
ReH (Mpa)
A(%)
Rm(Mpa)
A(%)
Rm (Mpa)
ReH (Mpa)
A(%)
St 35/E235
420
315
14
315
25
340-470
235
25
St 45
520
375
12
390
21
440-570
255
21
St 52/E355
580
450
10
490
22
490-630
355
22
Note:
The yield point for the annealed (GBK)condition on delivery is at least 50% of the (ultimate) tensile strength. Depending upon the degree of deformation in the drawing operation, the yield point of tubes delivered in the cold-finished/hard (BK)and cold-finished/soft(BKW) conditions, may be increased to a level close to the tensile strength.
In calculating the yield point, the following values are recommended : cold-finished/hard condition on delivery ≥ 80% of the tensile strength, cold-finished/soft condition on delivery ≥ 70% of the tensile strength.
Quality grade
The tubes are supplied in the following quality grades :
A) precision steel tubes intended primarily for mechanical stressing, without any particular quality requirement and without acceptance test certificate.
B) precision steel tubes intended primarily for mechanical stressing, with special quirement and exclusively with acceptance test certificate.
C) precision steel tubes with special requirement according to section 12. Theses requirements and corresponding tests must be agreed, with the customer having to specify his requirements at the time of enquiry and on ordering.
Condition on delivery:
Term
Symbol
Explanation
Cold-finished/hard
(cold-finished as-drawn)
BK
No heat treatment after the last cold-forming process. The tubes therefore have only low deformability.
Cold-finished/soft
(lightly cold-worked)
BKW
After the last heat treatment there is a light finishing pass (cold drawing) With proper subsequent processing, the tube can be cold-formed (e.g. bent, expanded) within certain limits.
Annealed
GBK
After the final cold-forming process the tubes are annealed in a controlled atmosphere or under vacuum.
Normalized
NBK
The tubes are annealed above the upper transformation point in a controlled atmosphere or under vacuum.
Surface treatment:
Oil-dip, Varnish, Passivation, Phosphating, Shot Blasting.
Both ends of each crate will indicate the order no., heat no., dimensions, weight and bundles.

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Sunny Steel Enterprise Ltd.: Contact nameSum Xuu
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Product Categories

Abrasion resistant pipe	Alloy steel pipe	Seamless steel pipe	Pipe fittings
Welded pipe	Flange	Rare earth alloy wear- esistant pipe	Cast basalt lined steel pipe
Bimetallic composite pipe	Ceramic lined pipe	Ceramic tile lined pipe and fittings	Ceramic sleeve lined Pipe
Ceramic Tile Lined Pipes	Tube shield	Valve

Seamless Precision steel tubes

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Product Tags:

Code number	Material number	Mfg. Process	C max	Si max	Mn max	P max	S max
St35	1.0308	S	0.17	0.35	0.4	0.05	0.05
St45	1.0408	S	0.21	0.35	0.4	0.05	0.05
St52	1.0508	S	0.22	0.55	1.6	0.05	0.05

Code number	Material number	Cold-finished hard(BK)		Cold-finished/soft (BKW) 3)
Code number	Material number	Rm(Mpa)	A(%)	Rm(Mpa)	A(%)
St 35/E235	1.0308	480	6	420	10
St 45	1.0408	580	5	520	8
St 52/E355	1.0508	640	4	580	7

Code number	Cold finished (soft)(BKW)			Annealed (GBK)		Normalized (NBK)
Code number	Rm(Mpa)	ReH (Mpa)	A(%)	Rm(Mpa)	A(%)	Rm (Mpa)	ReH (Mpa)	A(%)
St 35/E235	420	315	14	315	25	340-470	235	25
St 45	520	375	12	390	21	440-570	255	21
St 52/E355	580	450	10	490	22	490-630	355	22

Term	Symbol	Explanation
Cold-finished/hard (cold-finished as-drawn)	BK	No heat treatment after the last cold-forming process. The tubes therefore have only low deformability.
Cold-finished/soft (lightly cold-worked)	BKW	After the last heat treatment there is a light finishing pass (cold drawing) With proper subsequent processing, the tube can be cold-formed (e.g. bent, expanded) within certain limits.
Annealed	GBK	After the final cold-forming process the tubes are annealed in a controlled atmosphere or under vacuum.
Normalized	NBK	The tubes are annealed above the upper transformation point in a controlled atmosphere or under vacuum.