| After-sales Service: | Yes |
|---|---|
| Warranty: | Yes |
| Type: | Seamless |
| Technique: | Hot Rolled |
| Material: | Carbon Steel |
| Surface Treatment: | Black |
| Samples: |
|---|
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Audited Supplier GB 5310 20G Seamless steel tubes and pipes for high pressure boiler,GB 5310 20G Steel tubes shall be manufactured by hot rolling (extrusion, expansion) or cold drawing (rolling).
Standard:GB 5310
Seamless steel tubes and pipes for high pressure boiler
GB 5310 standard is applicable to steam boilers and pipeline seamless pipes for the manufacture of high pressure and above.
| Grade | Heat treatment |
| 20G | 880 ºC~940 ºC,Normalizing |
| Grade | Chemical Composition(%) | ||||||||||
| C | Si | Mn | Cr | Mo | V | Ni | Altot | Cu | P | ||
| Max | |||||||||||
| 20G | 0.17~0.23 | 0.17~0.37 | 0.35~0.65 | ≤0.25 | ≤0.15 | ≤0.08 | ≤0.25 | ≤0.015 | ≤0.20 | 0.025 | |
| Steel Pipe | Tensile properties | Impact energy(Akv),J | Hardness | |||||||
| Tensile strength (MPa) |
Yield Strength (MPa) |
Elongation % |
Portrait | Landscape | A | B | C | |||
| HBW | HV | HRC | ||||||||
| Portrait | Landscape | |||||||||
| Max | Min | |||||||||
| 20G | 410~550 | 245 | 24 | 22 | 40 | 27 | - | - | - | |
| Type of steel pipe | Outer diameter(mm) | Tolerance | |||
| ordinary | advanced | ||||
| Hot rolled tube | OD | ≤50 | ±0.40 | ±0.30 | |
| >50~≤325 | WT≤35 | ±0.75% | ±0.5% | ||
| WT>35 | ±1% | ±0.75% | |||
| >325 | ±1% | ±0.75% | |||
| WT | ≤4.0 | ±0.4 | ±0.3 | ||
| >4.0~≤20 | ±10% | ±7.5% | |||
| >20 | OD<219 | ±10% | ±7.5% | ||
| OD≥219 | +12.5% -10% |
±10% | |||
| Cold drawn tube | OD | ≤25.4 | ±0.15 | - |
| >25.4~≤40 | ±0.20 | - | ||
| >40~≤50 | ±0.25 | - | ||
| >50~≤60 | ±0.30 | - | ||
| >60 | ±0.5% | - | ||
| WT | ≤2.8 | ±0.2 | - | |
| >2.8 | ±7.5% | - |
1. Materials: Take the raw materials out of the raw material warehouse or procurement channels, and conduct inspection and sorting;
2, temperature control: according to the required performance of the product, choose the appropriate temperature, and control it within a certain range;
3. Heating: Use hot blast stove or other heating methods to heat raw materials to the required temperature;
4, annealing: the heated raw materials into the torch box for annealing treatment, in order to improve the mechanical properties of raw materials;
5. Hot rolling: Put the heated raw materials into the hot rolling mill, and process the raw materials through pressure to obtain the required products;
6, cooling: hot rolled products with water or other coolant for cooling, to ensure the stability of the product structure;
7, detection: physical and chemical performance test to determine whether it meets the requirements;
8. Finishing: Organize the products, label them, and prepare them for loading and delivery.
Used for economizer, reheater, water wall tube and other boiler tubes.
Our company was established in 2012, is a comprehensive company integrating industry and trade. The company has successively won the honorary titles of provincial integrity enterprise and municipal excellent enterprise. We are mainly engaged in various metal related products. Such as pipes, pipe fittings, rods, coils, profiles, medium and heavy plates, narrow strips and other types of materials. The warehouse has a variety of products of different specifications and materials, and the capacity is maintained at 30,000-50,000 tons/month. Products are widely used in petroleum, chemical, electric power, coal, machinery, high and low pressure boiler tubes, hydraulic props, ships and other industries. We make full use of the advantages of self-operated export rights and enter the international market. Our customers are located in South Korea, Canada, Iran, Pakistan, Indonesia, Vietnam, South America and other countries, and we have offices in Indonesia and Vietnam. The quality of our products is enjoyed at home and abroad. high reputation. We adhere to the business philosophy of "integrity service, win-win cooperation, customer first", and provide one-stop steel solutions for global customers. Welcome friends from all over the world to visit our company. We are looking forward to establishing business relationships and personal friendships with you.
Q:How do you control quality?
A:Mill test certification is supplied with shipment,third party inspection is avaliable.
Q:What are the advantages of your company?
A:We have many professionals,technical personnel,more competitive prices and best after-sales service than other stainless steel companies
Q:How many coutries you already exported?
A:Exported to more than 50 countries mainly from Arab, Kuwait, Egypt, Turkey, Jordan, Brazil, India, Indonesia, Korea, etc
Q:Can you provide sample?
A:Small sample in store and can provide the sample for free.Customized samples will take about 5-7days
Q:Why should you buy from us not from other suppliers?
A:Diversified products, direct supply from manufacturer.
Q:What is your terms of payment ?
A:we accept T/T ,L/C ,D/A,D/P, Western union, paypal ,The payment method can be negotiated by both parties according to the actual situation.
Please Please leave your enquiry in the message box at the bottom of the product page and click SEND, we will contact you as soon as possible!
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Audited Supplier 
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