2391 St30si 1.0211 Seamless Precision Steel Tube

• Customization: Available
• After-sales Service: Technical/Sample/Quality
• Type: Seamless
• Model NO.: st 30 Si 1.0211
• Technique: Hot-Rolled+Cold-Drawn
• Material: Carbon Steel
• Surface Treatment: as Required
• Usage: Hydraulic/Automobile Pipe, Machinery Industry, Special Purpose
• Section Shape: Round
• Cutting Service: Available
• Mtc: 3.1 or 3.2 Certificate
• Transport Package: Seaworthy Standard Package
• Specification: 8-200mm
• Trademark: SHUNFU
• Origin: China
• Production Capacity: 50000tons/Year

Product Description

2391 Precision Seamless Steel Tube

DIN 2391 Specification for Seamless cold drawn steel tubes for automobile, mechanical and general engineering purposes - Specific requirements for cold drawn Seamless Steel Tubes. cold drawn seamless tubing possesses a high strength-to-weight ratio and can be processed to provide a combination of desired characteristics: dimensional accuracy; good surface quality; excellent micro-structure uniformity; good machinability; and high tensile properties. It is also suited for such post-treatments as carburizing and heat treating.
 

Benefits Of 2391 Seamless Steel Tubes

Higher Strength & Hardness Properties
Size Accuracy
Enhanced Appearance
Uniform Micro-structure
Easier To Machine
Superior Finish In Subsequent Manipulations
 

2391 Seamless Steel Tubes Applications

1.Hydraulic Cylinders
2.Auto and Truck Axles
3.Suspension parts and shock absorbers
4.High Speed Shafts and rollers
5.Bearings and Spacers
6.Roll cages
7.Agricultural components and many other machined tubular parts.
 

Standards

BS EN 2391 specific requirements for Precision Seamless Steel Tubes
 

2391 Seamless Steel Tubes Chemical Component

Grade	Number	C max	Si max	Mn	P max	S max
st 30 Si	1.0211	0.1	0.3	≤0.55	0.025	0.025
st 30 AL	1.0212	0.1	0.03	≤0.55	0.025	0.025
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	1.0589	0.22	0.55	≤1.60	0.025	0.025

 

2391 Seamless Steel Tubes Mechanical Property

Grade	Number	BK cold finished hard		BKW (soft)		BKS cold finished + stress			GBK annealed		NBK Normalized
		Tensile Strength (Rm)	Elongation (A)	Tensile Strength (Rm)	Elongation (A)	Tensile Strength (Rm)	Yield Strength Re min.	Elongation (A)	Tensile Strength (Rm)	Elongation (A)	Tensile Strength (Rm)	Yield Strength Re min.	Elongation (A)
st 30 Si	1.0211	430	8	380	12	380	280	16	280	30	290-420	215	30
st 30 AL	1.0212	430	8	380	12	380	280	16	280	30	290-420	215	30
st 35	1.0308	480	6	420	10	420	315	14	315	25	340-470	235	25
st 45	1.0408	580	5	520	8	520	375	12	390	21	440-570	255	21
st 52	1.0589	640	4	580	7	580	420	10	490	22	490-630	355	22

 

2391 Seamless Steel Tubes Delivery Condition

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.

2391 Seamless Steel Tubes Drawing Process

Floating/Drawing process of pulling a metal bar, rod, or wire through the whole of a die to alter its finish, shape, size, and/or mechanical properties. The tube drawing technique reduces the outer diameter, inner diameter, and wall thickness of the tube.

 

2391 Seamless Steel Tubes Manufacturing process

The tubes shall be manufactured from electric Seamless pre-tubes by cold drawing or other suitable processes. The tubes shall not include welds used for joining lengths of flat rolled strip prior to forming the pre-tube.

2391 Seamless Steel Tubes Packaging

Straight lengths of seamless tubing can be individually sleeved in paper or plastic and/or packaged in our unique cardboard spacers to ensure no damage occurs during transit. Coiled seamless tubes are horizontally packed using paper or cardboard separators to prevent tube-to-tube contact. All tubing is packed in either wooden crates lined with wax craft paper, tri-wall clay-coated reinforced cases, or standard cardboard boxes. Plastic end caps that prevent foreign material from getting inside the tubes are also available upon request.
 

Other Services

1 Cutting: Small pieces
2 End: Plaint or Beveled or threaded
3 CNC Machine: Produce as your drawing
4 Package: Bare/Nylon/Canvas/Wooden
5 Payment:T/T, L/C, O/A(request credit)
6 Transport:FOB/CFR/CIF/DDU/DDP (train/ship/Air)
 

Contact 2391 Seamless Steel Tubes Today

Contact us for more information regarding precision steel tubing specifications and product options, or request a quote for further pricing details today.