Cold Finish Tube BK , GBK , BKW , BKS , NBK Cold Drawn Seamless Tube , Black Phosphate manufacturer from China Tianjin LANG Steel Pipe Manufacturing Co., Ltd.

Cold Finish Tube BK , GBK , BKW , BKS , NBK Cold Drawn Seamless Tube , Black Phosphate

Place of Origin:

Tianjin, China (Mainland)


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Product Detail

Cold Finish

Cold Finish Tube BK , GBK , BKW , BKS , NBK Cold Drawn Seamless Tube , Black Phosphate

Specifications

cold finish tube BK, GBK, BKW, BKS, NBK cold drawn seamless tube
GB 3639 DIN 2391 EN 10305 BS6323

cold finish tube BK, GBK, BKW, BKS, NBK cold drawn seamless tube

Production range: OD from 3.75mm to 70mm; wall thickness up to 10mm

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	10305-1	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
ASTM	A179-A450	A450
ASTM	A822-A450	A450
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

SURFACE TREATMENTS

1. Bare Tube (No coating): Bright and smooth

A. Silver galvanized

B. Yellow galvanized