carbon steel pipe according to different standard

For Carbon ERW steel pipe

1) Dimensions: OD: 20mm~1067mm, Thickness: 1.0~25.0mm,  Length: ≤13m  

2) Material: Q195, Q215, Q235, Q345, STK500 ,GR.B,X42,X46,X52,X56,X60,X65,X70,L245,X290

3) Standard:GB/T 3091-2001, BS1387-1985, ASTM A53.API 5L/API 5CT

4) Use: Used for low pressure liquids delivery, such as water, gas, and oil5) Packing: In hexagon bundle with pvc plastic sheet and slings

Electric Resistance Welded Steel Pipe

Usage:Used for low pressure liquid delivery, such as water, gas, and oil. Oil drilling and machinery manufacturing, etc.

ERW :Electric Resistance Welded pipe

HFI:High Frequency Induction weld pipe

EFW:Electric Fusion Welded Pipe

Standard:API 5L, API 5CT, ASTM 53, EN10217, DIN 2458. IS 3589, JIS G3452, BS1387

Certificate:API 5L PSL1/ PSL2, API 5CT

Out Diameter:21.3mm - 610mm

Wall Thickness:1.8 - 22mm/li>

Length:0.3 – 12m

Steel Grade:API 5L : GR B, X42, X46, X56, X60, X65, X70ASTM A53: GR A, GR B, GR CEN: S275, S275JR, S355JRH, S355J2HGB: Q195, Q215, Q235, Q345, L175, L210, L245, L320, L360- L555

Surface:Fusion bond Epoxy coating, Coal Tar Epoxy, 3PE, Vanish Coating, Bitumen Coating, Black Oil coating as per customer's requirement

Test:Chemical Component Analysis, Mechanical Properties (Ultimate tensile strength, Yield strength, Elongation), Technical Properties (Flattening Test, Bending Test, Blow Test, Impact Test), Exterior Size Inspection, Hydrostatic Test, X-ray Test.

Introduction:The hot rolled steel pipe (hot rolled seamless tube) is manufactured through automatic continuous pipe rolling mills. Precisely temperature (recrystallization temperature) controlling is required during different rolling processes, like initial rolling stage, finish rolling stage and curling stage, to achieve microstructure and mechanical structure of steel plates, Thus, they can be deformed to a large extend.

By the process of hot rolling, the original casting structure of the steel slab for making hot rolled steel pipe (hot rolled seamless tube) is destroyed. So that the crystalline grains of steel material can be refined, and the defects of the microstructure of steel slab are eliminated. Hence, hot rolled steel pipe (hot rolled seamless tube) features good mechanical property and superior intensity. It is widely used for transfer fluid, such as petroleum, natural gas, coal gas, water and some solid materials, also ship-building, chemical fertilizer equipment etc.

Take steel plate rolling as an example. The thickness of continuous casting slab, the material for making steel plates, is approx 230mm. However, through rough rolling and finish rolling, the thickness can be reduced to 1-20mm. Due to the small flakiness ratio of steel plates, there is a low requirement on the plate dimensional accuracy. But the crown control is still necessary during steel plate rolling process.

Production flow:The hot rolling process of the pipe is as follows: Steel billet → heating → punching (piercing) → three-roller skew rolling (helical rolling, tandem rolling or extrusion) → tube knockout → tube diameter reducing → cooling → semi-finished pipe → straitening → water pressure test → labeling → warehouse entry. 1. What have to stated is that the in the rolling process, the finished casting slab can be 1~20mm, while before that the thickness of continuous casting slab is around 230mm. So the crown control is important. 2. When use solid tube blank as raw material, remove the defects on the tube blank surface is necessary. 3. All step of the whole process is under strict control to ensure high quality products.

Classification: We can classify the hot rolled steel pipe (hot rolled seamless tube) as: 1. Common Hot Rolled Steel Pipe 2. Medium and low pressure boiler pipe 3. High pressure boiler steel tube And also can call them alloy tube, stainless steel pipe; oil cracking pipe and geology steel tube.

Further information: 1. Executive standards: GB/T 8162/8163, ASME B36.10, ASTM A106/A53, API 5L/5CT, DIN. 2. Specification range OD: 3"-24" WT: SCH10-SCHXXS 3. Materials: 10#, 20#, 45#, 16Mn, GrB, Q345B, X42-56, ST44, ST52 etc. 4. Testing: Eddy current/ Hydrostatic/Ultrasonic/ Intergranular Corrosion etc. 5. Packing of hot rolled seamless tube: Bundles, seaworthy packing, or as required by customers.