FUSHUN Metals

ST35 ST52.3 DIN2391 Precision Bright Surface Seamless Steel Tube

Group Cold Drawn Seamless Steel Tubes
Min. Order 3 ton
Terms of Payment L/C, D/A, D/P
Update Time 2019-06-12
Item specifics
OD range10-120 mm
Delivery conditionBK, BKS, GBK, NBK
Surface conditionBright, Smooth, black
  • Description
  • Product review

1. Description:

The DIN2391 steel  tubes have closer dimensional tolerances, better surface finish and higher mechanical properties than the corresponding grades of hot finished seamless tubes.

2. Application:

High Precision Steel Tube is used in automotive industry, and in the occasion where the high accuracy, brightness, cleanness of the tube are required.

3. Main Features

l Superior surface finish

l High yield strength

l Dimensional accuracy and excellent micro-structure uniformity

l Enhanced machinability

l High strength to weight ratio

l Tight tolerances, resulting in reduced machine time

l Possible spiraling eccentricity inherent in product

4. Quality Standard:

DIN 2391 Seamless precision steel tube

BS EN 10305-1 Seamless cold drawn tubes

BS EN 10305-4 Seamless cold drawn tubes for hydraulic and pneumatic power systems

BS 6323-4 Cold finished seamless steel tube

ASTM A519 Seamless Carbon and alloy steel mechanical tubing

JIS G3441 Alloy Steel Tube for machine purpises

JIS G3445 Carbon steel tube for machine structural purposes

5. Delivery Conditions:

+C (BK) Hard. No final treatment after final cold rolling.
+LC (BKW) Soft. Final heat treatment is followed by a suitable drawing pass (limited reduction of area).
+SR (BKS) Stress Relieved. After final cold rolling, the tubes are stress relieved in a controlled atmosphere.
+A (GBK) Annealed. After final cold rolling, the tubes are annealed in a controlled atmosphere.
+N (NBK) Normalized. After final cold rolling, the tubes are normalized in a controlled atmosphere.

6. Mechanical Properties( T=20℃ if not differently stated ):

Grades

Delivery Conditions

Tensile Strength Rm (Mpa)

Yield Strength R2 (Mpa)

Elongation in the longitudinal direction Al (%)

St 35

+C (BK)

480 min

/

6 min

St 35

+LC (BKW)

420 min

/

10 min

St 35

+SR (BKS)

420 min

315 min

14 min

St 35

+A (GBK)

315 min

/

25 min

St 35

+N (NBK)

340-470

235 min

25 min

St 52

+C (BK)

640 min

/

4 min

St 52

+LC (BKW)

580 min

/

7 min

St 52

+SR (BKS)

580 min

420 min

10 min

St 52

+A (GBK)

490 min

/

22 min

St 52

+N (NBK)

490-630

355 min

22 min

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