Din1629 St37 Nbk Cold Drawn Seamless Tube

Din1629 St37 Nbk Cold Drawn Seamless Tube

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Basic Info

Product Description

DIN1629 St37 NBK Cold Drawn Seamless Tube

Steel grades:

Standard Tubes
Standards	TDR Standards	Steel Grades
DIN	1629 1630 2391-2 17204 17210	ST 37 / 44 / 52 ST 37.4 / 44.4 / 52.4 ST 35 / 45 / 52 C22 – Ck 22 – Cm22 – C35 – Ck 35 – Cm 35 C45 - Ck 45 – Cm 45 – 34 CrMo4 C15 – Ck 15 – Cm 15 – 16MnCr5
EN	10305-4	E215/235/355/255 26Mn 5 C35E C45E 20V1 (E410) 26Mo2 25CrMo4 42CrMo4
GB	3639	10#, 20#, 16Mn, 45#
ASTM	A 519	1010 1020 1035
BS	BS 6323	CFS3 CFS4 CFS5 CFS6 CFS7
NFA	49310	TU 37 b TU 52 XC

Delivery conditions:

Precision tubes are delivered in following conditions

BK (+C) Cold finished/hard (cold finished as drawn).
No heat treatment after last cold forming process.
BKW (+LC) Cold finished/soft (lightly cold worked).
After last heat treatment there is a light finishing pass (cold drawing).
BKS (+SR) Cold finished/stress relieve annealed.
After the final cold forming process the tubes are stress relieve annealed.
GBK (+A) Annealed.
After the final cold forming process the tubes are annealed in a controlled atmosphere.
NBK (+N) Normalized.
After the final cold forming process the tubes are annealed above the upper transformation point in a controlled atmosphere.

Tests: 100% eddy current test, chemical and mechanical inspection, size checking and others

Certificates: according to EN 10204 3.1

Packing: Bundles or boxes

SURFACE TREATMENTS

1. Bare Tube (No coating): Bright and smooth, Surface Roughness both inner and outer surface 0.2Ra Maximum for special requirement

2. Surface Coating

A. Silver galvanized

B. Yellow galvanized

C. Olive green coated

Layer thickness: 8-20um, Salty Spray Test: 48-150 hours

3. Black phosphate

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