Black Mild 4mm Thickness Seamless Steel Pipe Cold Drawn

1 Tons
1,250.00 $
Black Mild 4mm Thickness Seamless Steel Pipe Cold Drawn
Features Gallery Product Description Request A Quote
Material: API, ASTM, DIN, GB, API 5CT, API 5L, ASTM A106-2006
Outer Diameter:: 25 - 356 Mm
Thickness:: 4 - 70 Mm
Standard:: JIS, AiSi, ASTM, GB, DIN, EN
Processing Service:: Bending, Welding, Decoiling, Punching, Cutting, Moulding
Type:: Round Pipe Tube
Surface:: Bare/Oil/Paint/Varnish
Length: 1000-6000mm Or Customer's Requirement
Grade: A53-A369, A179-C, A192, A178-C
Tolerance:: ±1%
Technique: Cold Rolled Hot Rolled
Application: Construcion/Building /Industry
High Light:

4mm Thickness Seamless Steel Pipe


25mm od Seamless Steel Pipe


25mm od cold drawn seamless steel tube

Basic Infomation
Place of Origin: Tianjin
Brand Name: Gnee
Certification: SGS
Model Number: A179
Payment & Shipping Terms
Packaging Details: seaworthy export packing with fumigated wooden pallets or steel pallets
Payment Terms: L/C, D/A, D/P, T/T, Western Union, MoneyGram
Supply Ability: 10000 Tons per Month
Product Description

Cold Drawn Seamless Mild Steel Tube Carbon Steel Pipe Alloy Steel Pipe Seamless Black Steel Pipe

1.Commodity name:Seamless astm a106/a53grb sch40 cold drawn steel pipe


3.Grade: 10#(St37/St37.2/St35.8),20#(aisi1020,ck20,St42-2/St45-8/St45-4),

45#(aisi1045,ck45,ASTM A1045),st52(16Mn,Q345D),25Mn(stkm13c-t),27SiMn


5.ID tolerance:H8,H9,H10

6. Wall thickness:10%×ID

7.Surface roughness:Ra 0.02— 0.4μm

8. Delivery condition:BK,BKW,BKS,GBK,NBK

9.Package: steel strip bundles, black paint coating, beveled ends or plain

10.Payment Terms: L/C or T/T(30% deposit and 70% balance against B/L copy)

11.Price Item:EXW,FOB,CFR or CIF

12.Delivery Time: Usually 15 working days after order confirmed& getting T/T deposit or original L/C


Mechanical Performance


Delivery Condition Cold drawn+ stress-relieved(BK+S)(SR) Cold fished (hard)(BK)
Steel Grade

Tensile strength

(Rm Mpa)

Yield strength Elogation A5%

Tensile strength

(Rm Mpa)

Elogation A5%



≥375 ≥15 ≥550 ≥8
45# ≥600 ≥520 ≥10 ≥640 ≥5
E355(Q345B,St52) ≥600 ≥520 ≥14 ≥640 ≥5
25Mn ≥600 ≥510 ≥15 ≥640 ≥5
27SiMn ≥760 ≥610 ≥10 ≥800 ≥5


ID Tolerance:

OD GB/T3639(GB8713) DIN2391(EN10305) Our Tolerance Best Quality
31-40mm ±0.15mm ±0.15mm ±0.05mm ±0.03mm
41-50mm ±0.20mm ±0.20mm ±0.05mm ±0.03mm
51-60mm ±0.25mm ±0.25mm ±0.08mm ±0.03mm
61-70mm ±0.30mm ±0.30mm ±0.10mm ±0.05mm
71-160mm ±0.30mm ±0.30mm ±0.10mm ±0.05mm
Tolerance in WT ±0.12mm ±0.10mm ±0.05mm ±0.03mm


Delivery condition:

1. NBK(+N)

after cold forming, eventually above phase transition point, in a protective atmosphere of annealing oxidation medium

2. GBK(+A)

after cold forming, annealing in non oxidizing medium protective gas

3. BK(+C)

the final heat treatment after cold forming, therefore small steel pipe plastically, the plastically degree does not guarantee

4. BKW(+LC)

after final heat treatment, a tiny cold drawing deformation, continue again when machining steel pipe allowed inside certain limits cold deformation(bending, flaring)

5. BKS(+SR)

have a stress relief after cold forming, heat treatment, steel pipe can be carried out within a certain limit in the appropriate processing again


Cold Drawn Seamless Mild Steel Tube Carbon Steel Pipe  Alloy Steel Pipe Seamless Black Steel Pipe



1.Hydraulic Cylinder Tube---Used in the hydraulic cylinder of the heavy machinery, Cranes, excavator also forklifts. Material is various, mainly STKM-13CT, ST52, CK45 and 1020. We can work and get the mechanical property of the clients need and extended the life of the hydraulic cylinder.




2.SRB tube ----- Used in Elevator,buffer and Hydraulic Cylinder .This kind tube have a better roughness inner the tube, ra0.2-0.4um and can use directly in the hydraulic cylinder tube.

Range: ID 50-250mm and Length can work at most 6M.



3.Cold finished tube---- Widely Used. Processing range 30-300mm, biggest length is 11M.

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