Seamless Precision Tube EN10305-1 14x4 5 NBK

OD:4-76mm

Wall thickness:0.5-8mm

Material:E215 E235 E355 ST35,ST37.4,ST45,ST52.4 etc

Delivery condition:

The tubes can be produced in the following delivery conditions:

BK (+C) Cold finished/hard (cold finished as drawn).

No heat treatment after the last cold forming process.

BKW (+LC) Cold finished/soft (lightly cold worked)

After the 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. (Mainly focus on)

After the final cold forming process the tubes are annealed above the upper transformation point in a controlled atmosphere

Production routing:

Quality carbon steel from bao steel etc big mill, cold drawing the heat treatment without oxidization , NBK condition. Do nondestructive testing ,HT tests and do dipping oil antirust protection, Packed tube in wooden boxes.

Main feature:

High precision

Excellent brightness

No oxidization on outer and inner walls after heat treatment

High cleanness of inside wall

High pressure

No deformation after clod bending

No crack after flaring and flattening

Color : Gray with white

Application:

Hydraulic system

Automobile

Tolerance

Surface:

NBK

Galvanization/Galvanized/Zinc Coated

Blue White Zinc (Trivalent Chromium Passivation)

Plating Colour Zinc(Trivalent Chromium Passivation)

Yellow, Army-Green

Phosphated/Black Phosphated

Surface quality

Without oxidization

No crack

No fold

No rolling fold

No scar

No laminar defect

What we can do in our testing center

Physis laboratory

Chemical spectrometer

Pressure blasting machine

Metallographic analysis

Salt Spray Test

Stock size list.

Key words

Precision Steel Tubes

Precision Seamless Steel Tubes

High Precision Seamless Steel Tubes/Pipe