Popular Design for China ASTM/ASME A335/SA335 P91 Seamless Carbon Steel Pipe/Boiler Tube for High-Temperature Service
To constantly improve the management system by virtue of the rule of “sincerely, good faith and quality are the base of enterprise development”, we widely absorb the essence of related products internationally, and constantly develop new products to meet the demands of customers for Popular Design for China ASTM/ASME A335/SA335 P91 Seamless Carbon Steel Pipe/Boiler Tube for High-Temperature Service, We have now a big inventory to fulfill our customer’s calls for and needs.
To constantly improve the management system by virtue of the rule of “sincerely, good faith and quality are the base of enterprise development”, we widely absorb the essence of related products internationally, and constantly develop new products to meet the demands of customers for China Boiler Tube, seamless steel tube, If you need any of our products, or have other items to be produced, please send us your inquiries, samples or detailed drawings. Meanwhile, aiming to develop into an international enterprise group, we look forward to receiving offers for joint ventures and other cooperative projects.
Overview
Application
It is mainly used to make high-quality carbon structural steel, low pressure medium pressure boiler pipe, super heated steam seamless carbon steel pipe
Main Grade
Grade of high-quality carbon structural steel: 10#,20#
Chemical Component
| Standard | Grade | Chemical Composition(%) | |||||||
| C | Si | Mn | P | S | Cr | Cu | Ni | ||
| GB3087 | 10 | 0.07～0.13 | 0.17～0.37 | 0.38～0.65 | ≤0.030 | ≤0.030 | 0.3～0.65 | ≤0.25 | ≤0.30 |
| 20 | 0.17～0.23 | 0.17～0.37 | 0.38～0.65 | ≤0.030 | ≤0.030 | 0.3～0.65 | ≤0.25 | ≤0.30 | |
Mechanical Property
| Standard | Steel pipe | Wall thickness | Tensile strength | Yield Strength | Elongation |
| GB3087 | (mm) | (MPa) | (MPa) | % | |
| ≥ | |||||
| 10 | / | 335～475 | 195 | 24 | |
| 20 | ＜15 | 410～550 | 245 | 20 | |
| ≥15 | 225 | ||||
Tolerance
Permissible deviation of outer diameter of steel tubes
| Type of steel tube | Permissible deviation | ||||||
| Hot rolled (extruded, expanded) steel tube | ± 1.0% D or ± 0.50, take the greater number | ||||||
| Cold drawn (rolled) steel tube | ± 1.0% D or ± 0.30, take the greater number | ||||||
Permissible deviation of the wall thickness of hot rolled (extrusion, expansion) steel tubes
Unit: mm
| Type of steel tube | Outer diameter of steel tube | S / D | Permissible deviation | ||||||
| hot rolled (extruded) steel tube | ≤ 102 | – | ± 12.5 % S or ± 0.40, take the greater number | ||||||
| > 102 | ≤ 0.05 | ± 15% S or ± 0.40, take the greater number | |||||||
| > 0.05 ~ 0.10 | ± 12.5% S or ± 0.40, take the greater number | ||||||||
| > 0.10 | + 12.5% S | ||||||||
| - 10% S | |||||||||
| hot expand steel tube | + 15% S | ||||||||
Permissible deviation of the wall thickness of cold drawn (rolled) steel tubes
Unit: mm
| Type of steel tube | Wall thickness | Permissible deviation | ||||||
| Cold drawn (rolled) steel tube | ≤ 3 | 15 – 10 % S or ± 0.15, take the greater number | ||||||
| > 3 | + 12.5% S | |||||||
| - 10% S | ||||||||
Test Requirement
Flattening test
Steel tubes with an outer diameter greater than 22 mm and up to 400 mm, and wall thickness greater than 10 mm should undergo the flattening test. After the samples are flattened
Bending test
Steel tubes with an outer diameter not greater than 22 mm should undergo the bending test. The bending angle is 90o . The bending radius is 6 times the outer diameter of the steel tube.After bending the sample, no fissures or cracks are permitted to appear on the sample.
Macroscopic examination
For steel tubes directly made by continuously cast billets or steel ingots, the supplying party should guarantee that there are no white spots, impurities, sub-surface air bubbles, skull patches or layering on the cross-sectional acid pickled macroscopic tissue of the billet or steel tube.
Non-destructive inspection
According to the demanding party’s request, which is then negotiated between the supplying and demanding parties and indicated in the agreement, ultrasonic flaw detection may be individually performed for steel tubes. The longitudinal manual defect of the reference sample tube should meet the requirements for post-inspection acceptance grade C8 specified in GB/T 5777-1996.
Product Detail
High Pressure Boiler Tube
GB/T5310-2017
ASME SA-106/SA-106M-2015
ASTMA210(A210M)-2012
ASME SA-213/SA-213M
