ASTM4130 Cr-Mo Steel Bicycle Frame Carbon Steel Pipe Seamless Pipe

standard

steel grade

C (%)

silicon(%)

manganese(%)

small(%)

phosphorus(%)

Standard 2391

St35

≤0.17

≤0.35

≥0.40

≤0.025

≤0.025

St37

≤0.17

≤0.35

≥0.40

≤0.025

≤0.025

St37.4

≤0.17

≤0.35

≥0.40

≤0.025

≤0.025

St45

≤0.21

≤0.35

≥0.40

≤0.025

≤0.025

St. 44

≤0.21

≤0.35

≥0.40

≤0.025

≤0.025

St52

≤0.22

≤0.35

≥1.60

≤0.025

≤0.025

standard

steel grade

Mechanical behavior

National standard (+A)

NBK(+N)

to stretch

strength

(Ringgit MPa)

elongation

speed

(A5%)

to stretch

strength

(Ringgit MPa)

yield

strength

(Rehmpa)

elongation

speed

(A5%)

Standard 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

St. 44

≥390

≥21

440-570

≥255

≥21

St52

≥490

≥22

490-630

≥355

≥22

end shape

Beveled end, flat end, disappear, or add plastic caps to protect both ends according to customer's requirements

Require

surface

treat

Oiled, galvanized, phosphated, etc.

technology

Cold drawn and rolled

application

1. Automobile and mechanical pipes

2. Petroleum cracking pipe

3. High pressure boiler tube

4. Low and medium pressure fluid delivery pipelines

5. Fertilizer equipment pipes

6. Heat exchange tube

deliver goods

situation

1. BK (+C)

No heat treatment is performed after the last cold forming process.

2. BKW (+LC)

Light finishing (cold drawing) after final heat treatment

3. BKS (+SR)

After the final cold forming process, the tube is stress relieved annealed.

4. GBK (+A)

After the final cold forming process, the tube is annealed in a controlled atmosphere.

5. NBK (+N)

After the final cold forming process, the tube is annealed above the upper transition

Spot in a controlled atmosphere.

pack

1. Bundled packaging.

2. Flat end or disappear according to customer requirements.

3. Wrap with waterproof paper.

4. The linen belt has several steel belts.

5. Packed in a heavy three-wall box.