Product Details

Hexagonal 15-110mm Hexagon Shape Series Seamless Steel Pipes & Tubes Steel

Scope: This standard 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. Tubes according to this standard are mainly used where accuracy to dimension and possibly, small wall thickness and good surface condition are required.

Shape: HEX

Chemical Composition& Mechanical Properties(Type: Cold Drawn Seamless Mechanical/CDS)

Steel grade		Chemical composition, as a percentage by mass
Symbol	Material number	C max.	Si max.	Mn	P max.	S max.
St 35	1.0308	0.17	0.35	<=0.40	0.025	0.025
St 45	1.0408	0.21	0.35	<=0.40	0.025	0.025
St 52	1.0508	0.22	0.55	<=1.60	0.025	0.025
The following alloying elements may be added: Nb: <=0,03%; Ti: <=0,03%; V: <=0,05%; Nb + Ti + V: <=0,05%.

Final supply conditions

Designation	Symbol	Description
Cold finished (hard)	BK	Tubes do not undergo heat treatment following the final cold forming and, thus, have a rather high resistance to deformation.
Cold finished (soft)	BKW	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	BKS	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	The last cold forming process is followed by annealing in a controlled atmosphere.
Normalized	NBK	The last cold forming process is followed by annealing above the upper transformation point in a controlled atmosphere.

delivery condition		cold finished/ HARD(BK)		cold finished/ SOFT(BKW)		Annealed (GBK)		Normalized (NBK)
CODE NO.	Material NO.	TENSILE/mpa	ELONGATION/%	TENSILE /mpa	Elongation/%	TENSILE /mpa	Elongation/%	TENSILE /mpa
ST35	1.0308	440	6	370	10	315	25	340-470
ST45	1.0408	540	5	470	8	390	21	440-570
ST52	1.0508	590	4	540	7	490	22	490-630

Packaging & Shipping

Packing: Bare/bundles/crates/crate protection at the both sides of tubes or as per customers’ requirements .
Surface treatment:Oil-dip, Varnish, Passivation, Phosphating, Shot Blasting.
Marking: as per customer’s requirement

Product Description

TYPE 1.

A=FLAT TO FLAT SIZE

B=CORNER TO CORNER SIZE

WT=WALL THICKNESS

TYPE2.

****OD &INNER FLAT TO FLAT SIZE

TYPE 3:

*****ID&FLAT TO FLAT SIZE&CORNER SIZE

FAQ

* How long will it take to produce an order?
It is within 30days for the purchasing and production time with container order and 10days for the sample.

* What is your minimum order?
Usually 5 ton for each size.

* What form of quotation do you offer?
FOB Tianjin, CIF and CNF Your destination

* What is your payment term?
Payment is 30% deposit, 70% before shipment

* Does the sample for free or not?
The samples are free if they are common sizes, You need to pay for the freight .

* How do you guarantee the quality of the products?
All of our procedures are strictly operated under the ISO 9001:2008, and there are as many as 6 times of test during the production of each product to ensure the quality.