Seamless Steel Pipe for High Temperature Service

Standards There are many standards for seamless carbon steel pipe, such as ASTM A106/ASME SA106 ASTM A335/ASME SA335, JIS 3455/3456 and DIN 17175.

Steel GradeThere are various grades of steel to manufacture steel pipe for high temperatures service, such as A106A, A106B, A106C, STS 370/410, St35.8, St45.8, etc.

Applications This seamless carbon steel pipe is mainly for conveying water, oil, gas and other fluids.

Dimension ControlThe allowable dimension deviation of steel pipe for top temperature service is fixed by the common. Under the control of advanced rolling technology, JST can control the allowable size deviation of this seamless carbon steel pipe within the prescribed scope. We even narrow the tolerance range. JST likewise provide other specifications of high temperature steel pipes site customers’ requirements.

Advantages

JST has kinds of inspection equipment that will test the inner and outer surface quality of seamless carbon steel pontoons. In the production process, there always exist some surface quality defects, such as flaw, scar, wrinkling, laceration, rolling burr other people. We possess UNICORN ultrasonic joint inspection machine, automatic ultrasonic testing machine and magnetic flux leakage testing machine. They are usually employed for detecting obvious surface defects of steel pipe for prime temperature service.
Overlook the importance have professional inspection personnel who will detect the unobvious inner and outer surface defects on seamless carbon steel pipes. If find any flaw, they’ll do polishing, removal, repair and a set of processes in line with their specific similarities.

Parameters of Steel Pipe for High heat Service

1. Mechanical Properties

Standard Grade Tensile Strength (MPa) Yield Strength (MPa)
ASTM A106 A ≥ 330 ≥ 205
B ≥ 415 ≥ 240
C ≥ 485 ≥ 275

2. Chemical Composition of Seamless Carbon Steel Pipe

Standard Grade Chemical Composition
C Si Mn P S Cr Mo Cu Ni V
ASTM A106 A ≤ 0.25 ≥ 0.10 0.27-0.93 ≤ 0.035 ≤ 0.035 ≤ 0.40 ≤ 0.15 ≤ 0.40 ≤ 0.40 ≤ 0.08
B ≤ 0.30 ≥ 0.10 0.29-1.06 ≤ 0.035 ≤ 0.035 ≤ 0.40 ≤ 0.15 ≤ 0.40 ≤ 0.40 ≤ 0.08
C ≤ 0.35 ≥ 0.10 0.29-1.06 ≤ 0.35 ≤ 0.35 ≤ 0.40 ≤ 0.15 ≤ 0.40 ≤ 0.40 ≤ 0.08

Note:

  • When carbon content reduces 0.01% but is still below the maximum carbon content, we can increase Mn content by 0.06% above the maximum Mn content. But the maximum value should not exceed 1.35%.
  • The total content of Cu, Ni, Cr, Mo and V should not exceed 1.00%.

3. Allowable Tolerance of Steel Pipe for High Temperature Service
1) Size Tolerance

Type Outside Diameter (D) Wall Thickness (S)
Cold-Rolled Pipe Outside Diameter Allowable Tolerance Wall Thickness Allowable Tolerance
＞30-50 + 0.3% ≤ 25 + 10%
＞50-325 + 0.8%
Hot-Rolled Pipe ＞6-168 + 1.0% ≤ 25 – 10%, + 12.5%

2) Weight Tolerance
The weight of any seamless carbon steel pipe should not exceed ten percent of the rated value. Steel pipes with the nominal diameter of less than or equal to NPS 4, we can weigh them in batches, while for those with the nominal diameter of more than NPS 4, we will separately weigh. If there are some agreement between the manufacturer and the buyer, the above ones are not applicable.

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