Cold drawn precision welded steel tubes
Standard: EN10305-2, DIN2393
Steel grade: ST37-2, ST52-3, Q235B, Q345B, SAE1010, SAE1020,
Other carbon steel grades including alloyed steels and conditions
are on request of clients
Delivery condition: +C, +LC, +SR, +A, +N
Application: automotive (shock absorbers, steering system, safety
system, air springs).
Chemical composition, %
|Material No.||C, max||Si, max||Mn, max||P, max||S, max|
OD: Up to 70mm
WT: Up to 3mm
Length: Cut-to-length service is available, minimum to 30mm
Any specific size is to be discussed before offer
The tube be 100% eddy current tested
Ultrasonic test is as option
ID accuracy: H8, H9
Roughness: Ra ≤0.6
Delivery condition for availability:
|+C||Cold drawn / hard|
|+LC||Cold drawn / soft|
|+SR||Cold drawn and stress relieved|
The internal and external surface finish of the tubes shall be
typical of the manufacturing process and, where applicable, the
heat treatment, and it shall be such that any surface imperfections
such as ridges, dents or shallow grooves requiring dressing can be
Any surface imperfections, whose depth cannot be clearly
- It shall be permissible to dress, only by grinding or machining,
surface imperfections provided that, after doing so, the dimensions
are within the specified tolerances. All dressed areas shall blend
smoothly into the contour of the tube.
- Surface imperfections which encroach on the specified minimum wall
thickness shall be considered defects.
The tubes shall have smooth outer and inner surface. The roughness
Ra shall be:
≤4 μm on the outer and inner surface of tubes in the delivery
conditions +C and +LC.
≤4 μm on the outer surface of tubes in the delivery conditions +SR,
+A and +N.
The tubes are tested by means of following norms
Tubes shall be delivered with square cut ends. The ends are free of
The tubes are bundled in the waterproof plastic sheet and packed in
the wooden cases
The case is most suitable for hanging by forklift.
EN10204-3.1 MTC shall be issued
EN10204-3.2 MTC is as option