DIN2391 ST37 Properties carbon seamless steel pipe and tube

Executive

Standard

Specificaiton Range (mm)

Steel Grade

Cold drawn

seamless

precision tube

ST35,ST37.4,ST44,

ST45,ST52

NAME

Scope (mm)

DIN series(mm)

Out Diameter

3-30

±0.08

31-40

±0.15

41-50

±0.20

51-60

±0.25

Wall Thickness

0.5-8

±10%

Standard

Steel Grade

Mechanical Performance

GBK(+A)

NBK(+N)

Tensile

Strength

(Rm mpa)

Elongation

rate

(A5 %)

Tensile

Strength

(Rm mpa)

Yield

Strength

(Reh mpa)

Elongation

rate

(A5 %)

DIN 2391

St35

≥315

≥25

346-478

≥235

≥25

St37

≥315

≥25

346-478

≥235

≥25

St37.4

≥315

≥25

346-478

≥235

≥25

St45

≥390

≥21

440-570

≥255

≥21

St44

≥390

≥21

440-570

≥255

≥21

St52

≥490

≥22

490-630

≥355

≥22

End Shape

Beveled end, plain end, vanished, or adding plastic caps to protect the two ends as per custom er's requirements

Surface

Treatment

Oiled, Galvanized, Phosphate etc

Technique

Cold drawn

Application

1. Automotive and mechanical

2. Petroleum cracking

3. High Pressure Boiler Pipe

4. Low and middle pressure fluid transportation pipeline

5. Chemical fertilizer equipment

6. Heat exchanger

Delivery

Conditions

1. BK (+C)

No heat treatment after last cold forming process.

2. BKW (+LC)

After last heat treatment there is a light finishing pass (cold drawing)

3. BKS (+SR)

After the final cold forming process the tubes are stress relieve annealed.

4. GBK (+A)

After the final cold forming process the tubes are annealed in a controlled atmosphere.

5. NBK (+N)

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

Package

1. Bundle Packing.

2. Plain end or vanished as per customer's request.

3. Wrapped in waterproof paper.

4. Sackcloth with several steel strips.

5. Pack in heavy tri-wall boxes.

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