| Steel grade | Heat treatment a |
Austenizing | Tempering | |||
| Steel name |
Steel number |
Temperature °C | Cooling Medium |
Temperature °C | Cooling medium |
|
| P235GH | 1.0345 | +N b | 880 to 940 | Air | - | - |
| a +N = Normalising, +NT = Normalising + Tempering, +QT = Quenching + Tempering (air or liquid), +I = Isothermal Annealing. b Normalising includes Normalising Forming. |
||||||
| Steel grade | Steel number |
C | Si | Mn | P max |
S max |
Cr | Mo | Ni |
| P235GH | 1.0345 | ≤ 0,16 | ≤ 0,35 | ≤ 1,20 | 0,025 | 0,020 | ≤ 0,30 | ≤ 0,08 | ≤ 0,30 |
| Al tot | Cu | Nb | Ti max | V | Cr+Cu+Mo+Ni | Others |
| ≥ 0,020 | ≤ 0,30 | ≤ 0,010 | 0,040 | ≤ 0,02 | ≤ 0,70 | - |
| Steel grade | Upper yield strength or proof strength R eH or Rp 0,2 for Wall Thickness T min. |
Tensile Strength Rm |
Elongation A min. % a |
|||||
| Steel name | Steel number |
T ≤ 16 | 16 < T ≤ 40 | 40 < T ≤ 60 | 60 < T ≤ 100 | l | t | |
| MPa * | MPa * | MPa * | MPa * | MPa * | ||||
| P235GH | 1.0345 | 235 | 225 | 215 | - | 360 to 500 | 25 | 23 |
| Outside Diameter D mm | Tolerances on D |
Tolerances on T for a T/D ratio | |||
| ≤ 0,025 | > 0,025 ≤ 0,050 |
> 0,050 ≤ 0,10 |
> 0,10 | ||
| D ≤ 219,1 | ± 1% or ± 0.5mm whichever is the greater |
± 12,5% or ± 0.4mm whichever is the greater | |||
| D > 219,1 | ± 20% | ± 15% | ± 12,5% | ± 10% a | |
| a For outside diameters D ≥ 355,6 mm it is permitted to exceed the upper wall thickness locally by a further 5% of the wall thickness T | |||||
| Tolerances on inside diameter | Tolerances on T for a T/d ratio | |||||
| d | d min | ≤ 0,03 | > 0,03 ≤ 0,06 |
> 0,06 ≤ 0,12 |
> 0,12 | |
| ± 1% or ± 2 mm whichever is the greater | (+ 2% ,0)or (+ 4 mm,0) |
whichever is the greater | ± 20% | ± 15% | ± 12,5% | ± 10% a |
| a For outside diameters D ≥ 355,6 mm it is permitted to exceed the upper wall thickness locally by a further 5% of the wall thickness T | ||||||
| Outside diameter D mm | Tolerances on D | Tolerances on T min for a T min /D ratio | |||
| ≤ 0,02 | > 0,02 ≤ 0,04 |
> 0,04 ≤ 0,09 |
> 0,09 | ||
| D ≤ 219,1 | ± 1% or ± 0.5mm whichever is the greater |
(+ 28%,0) or (+ 0.8 mm,0) whichever is the greater | |||
| D > 219,1 | + 50% 0 |
+ 35% 0 |
+ 28% 0 |
+ 22% a 0 |
|
| a For outside diameters D ≥ 355,6 mm it is permitted to exceed the upper wall thickness locally by a further 5% of the wall thickness T | |||||
| Tolerances on inside diameter |
Tolerances on T min for a T min /d ratio |
|||
| d | d min | ≤ 0,05 | > 0,05 ≤ 0,1 |
> 0,1 |
| ± 1% or ± 2 mm whichever is the greater |
(+2%,0) or (+ 4 mm,0) whichever is the greater | + 35% 0 |
+ 28% 0 |
+ 22% a 0 |
| a For outside diameters D ≥ 355,6 mm it is permitted to exceed the upper wall thickness locally by a further 5% of the wall thickness T | ||||
| Length L | Tolerance on exact length |
| L ≤ 6000 | +10 0 |
| 6000 < L ≤ 12 000 | +15 0 |
| L > 12 000 | + by agreement 0 |
| Product Name | Executive Standard | Dimension (mm) | Steel Code / Steel Grade |
| Seamless Ferritic and Austentic Alloy Steel Boiler, Superheater and Heat-Exchanger Tubes | ASTM A213 | Ø10.3~426 x WT1.0~36 | T5, T9, T11, T12, T22, T91 |
| Seamless Ferritic Alloy Steel Pipes for High Temperature Use | ASTM A335 | Ø1/4"~42" x WT2~120mm | P5, P9, P11, P12, P22, P91, P92 |
| Seamless Carbon and Alloy Steel for Mechanical Tubing | ASTM A519 | Ø16"~42" x WT10~100mm | 4130, 4130X, 4140 |
| Product Name | Executive Standard | Dimension (mm) | Steel Code / Steel Grade |
| Seamless Ferritic Alloy Steel Pipes for High Temperature Use | EN10216-2 | Ø8"~42" x WT15~100 | 13CrMo4-5, 1-CrMo9-10, X10CrMoVNb9-1, 15NiCuMoNb5-6-4 |
Hebei shengtian pipe-fitting group Co., ltd. is located in Mengcun County, Cangzhou City, Hebei PR, China.
Established in 1989, covers a land area of 100,000㎡,with registered capital up to USD 28 million. It has over 380 employees, including over 90 professionals and technicians. The main products are seamless steel pipe, erw steel pipe, lsaw steel pipe, ssaw steel pipe etc. Especially Custom prefabricated piping is our specialty products. It can carry out production according to the standards such as GB, HG, SH, ANSI, ASME, API 5L, OCTG, DIN and JIS etc., and its products are exported to over most countries and regions in Southeast Asia, the Middle East, Europe and America etc., enjoying a very good reputation in the domestic and foreign markets. The company has nondestructive testing apparatus, supersonic testing apparatus, universal testing machine, impact tester and physical & chemical labs, forming a complete quality assurance system.
The company has established a scientific quality assurance system and obtained the certificates such as “API 5L", "BV", "CE", “the ISO 9001-2000 QUALITY SYSTEM CERTIFICATION”, “ISO14001 ENVIRONMENT MANAGEMENT SYSTEM/OHSAS18001 SAFETY MANAGEMENT SYSTEM CERTIFICATION”, “the special manufacturing processes are an effective guarantee for product quality.
We always adhere to honesty and service-oriented purpose, to serve each of our customers. We sincerely welcome customers at home and abroad to visit us and seeking common development.
EN 10216-2 Grade P235GH Seamless CS Boiler Tube High Pressure Pipe is about 20% higher than a welded pipe. So in applications that have a higher working pressure as a prerequisite, the use of a seamless pipe is justified. Though stronger than a welded pipe, the cost is much higher. Furthermore, the risk of intergranular corrosion at the heat affected weld zone is more in a welded product. The visible difference between an Alloy Steel Welded Pipe and a seamless product is the latitudinal seam along the length of the pipe. However, today, with the advancement in technology, the seam present on the Alloy Steel ERW Pipe could considerably be reduced via means of a surface treatment, such that it remains invisible to human eyes..
