GB 28883 Composite Seamless Steel Tubes For Pressure
Price:
800-1000 USD/Tons
MOQ:
1 Tons
Delivery Time:
20-30days upon products
Brand:
TORICH
Product Description
GB 28883 Composite Seamless Steel Tubes for Pressure
GB 28883 composite seamless steel tubes are pressure-bearing bimetallic seamless tubes designed for boilers, pressure vessels, and pressure piping where the tube must combine mechanical strength from the base metal with corrosion resistance from the cladding metal. The standard defines the tube as a composite structure made from different inner and outer steel grades, with ordering based on “outer grade + inner grade” and wall thickness shown as “base layer + cladding layer.” The standard scope covers dimensions, tolerances, technical requirements, testing, inspection, marking, packaging, and quality certificates for pressure service.
Specifications
| Item | Specification |
|---|---|
| Material | Composite seamless steel tube: carbon/alloy steel base layer + stainless steel, duplex stainless steel, or corrosion-resistant alloy cladding layer |
| Standard | GB 28883 / GB/T 28883, Composite Seamless Steel Tubes for Pressure |
| Common Base Grades | 10, 20G, 20MnG, 16Mn, 15MoG, 12CrMoG, 15CrMoG, 12Cr1MoVG |
| Common Cladding Grades | 07Cr19Ni10, 022Cr19Ni10, 022Cr17Ni12Mo2, 022Cr22Ni5Mo3N, NS1402, NS3102 |
| Outer Diameter | 10–426 mm |
| Wall Thickness | 2–60 mm |
| Base Layer Thickness | 50%–90% of nominal wall thickness |
| Cladding Layer Thickness | 10%–50% of nominal wall thickness |
| Length | Standard 4,000–12,000 mm; customized 1–12 m available by agreement |
| Fixed Length Tolerance | +20 / 0 mm |
| OD Tolerance, Hot Rolled / Extruded | ≤80 mm: ±0.40 mm; >80–325 mm: ±0.75%D or ±1%D depending on wall thickness; >325 mm: ±1%D |
| OD Tolerance, Cold Rolled / Drawn | ≤80 mm: ±0.30 mm; >80–219 mm: ±0.75%D; >219–325 mm: ±0.75%D or ±1%D; >325 mm: ±1%D |
| Wall Thickness Tolerance | Hot rolled: +12.5% / -10%; cold drawn: S≤3 mm ±0.30 mm, S>3 mm ±10% |
| Straightness | S≤15 mm: ≤1.5 mm/m; 15<S≤30 mm: ≤2.0 mm/m; S>30 mm: ≤3.0 mm/m |
| Full-Length Straightness | For nominal diameter ≥127 mm: ≤0.1% of tube length |
| Surface Condition | Pickled or polished; free from cracks, folds, scabs, laps, rolling folds, and delamination |
| Heat Treatment | Supplied in heat-treated condition; heat treatment process recorded in the quality certificate |
| Pressure Test | Hydrostatic test on each tube; maximum test pressure 20 MPa; holding time ≥10 s; no leakage permitted |
Key Features
- Defined composite wall structure: base metal thickness is controlled at 50%–90% of total wall thickness, while cladding thickness is controlled at 10%–50%, allowing the tube to balance pressure strength and corrosion resistance.
- Verified bonding performance: metallurgical fusion composite tubes require bonding shear strength of ≥210 MPa, and metallurgically bonded explosion-formed composite tubes require ≥140 MPa. Buyers may specify ≥260 MPa for metallurgical fusion composite tubes.
- Pressure integrity control: each tube is hydrostatically tested using P = 2SR/D, with allowable stress based on 80% of the base metal yield strength, maximum pressure 20 MPa, and holding time not less than 10 seconds.
- NDT requirement for fusion composite tubes: metallurgical fusion composite seamless tubes require full-length ultrasonic testing according to GB/T 5777-2008, acceptance level L2.
- Surface defect limit: surface defect removal depth must not exceed 10% of wall thickness, and the remaining wall thickness must not be less than the minimum permitted value. Straight-line surface defects must not exceed 4% of wall thickness, with a maximum depth of 0.2 mm.
Our Advantages
| Buyer Concern | Our Solution |
|---|---|
| Bonding failure or delamination during bending, flattening, or pressure service | We control the base/cladding interface and support shear strength testing. For metallurgical fusion composite tubes, bonding shear strength can be supplied to ≥210 MPa, or ≥260 MPa when specified by the purchaser. Flattening inspection can verify no visible delamination or cracking. |
| Pressure safety and leakage risk | Each tube can be supplied with hydrostatic testing according to GB 28883, with maximum test pressure up to 20 MPa, holding time ≥10 s, and no leakage permitted. Eddy-current testing may be used as an agreed alternative for metallurgical fusion composite tubes. |
| Corrosion resistance of the cladding layer | Stainless, duplex stainless, or corrosion-resistant alloy cladding grades are available. The cladding layer can be tested for intergranular corrosion according to GB/T 4334-2008 Method E, helping confirm suitability for corrosive fluid contact. |
Execution Standards
| Standard System | Related Standard | Brief Description |
|---|---|---|
| GB | GB 28883 / GB/T 28883 | Composite seamless steel tubes for pressure; main applicable standard |
| GB | GB/T 17395 | Dimensions, shape, weight, and allowable deviations for seamless steel tubes |
| GB | GB/T 5777 | Ultrasonic testing method for seamless steel tubes |
| GB | GB/T 4334 | Intergranular corrosion test for stainless steel cladding |
| ASTM | ASTM A213 / A789 / A790, by technical agreement | Used for reference when buyers require stainless or duplex pressure tube comparison; not a direct one-to-one composite tube equivalent |
| EN | EN 10216 series, by technical agreement | Seamless steel tubes for pressure purposes; used as pressure tube reference for European projects |
| JIS | JIS G3458 / JIS G3463, by agreement | Alloy steel and stainless steel tubes for pressure or heat exchanger service reference |
| GOST | GOST 9941 / related pressure tube standards, by agreement | Seamless corrosion-resistant steel tube reference for CIS-market documentation |
Application Field
Application: waste heat boiler evaporator tube for sulfur-containing chemical process gas.
This application needs a pressure-bearing base layer for boiler service and a corrosion-resistant cladding layer on the fluid-contact side to reduce corrosion risk from aggressive process media.
Chemical Composition
The following table lists five common base metal grades under GB 28883. Values are mass fraction, %.
| Grade | C | Si | Mn | Cr | Mo | V | P Max | S Max |
|---|---|---|---|---|---|---|---|---|
| 20G | 0.17–0.23 | 0.17–0.37 | 0.35–0.65 | — | — | — | 0.025 | 0.015 |
| 20MnG | 0.17–0.23 | 0.17–0.37 | 0.70–1.00 | — | — | — | 0.025 | 0.015 |
| 16Mn | 0.12–0.20 | 0.20–0.60 | 1.20–1.60 | — | — | — | 0.025 | 0.015 |
| 15MoG | 0.12–0.20 | 0.17–0.37 | 0.40–0.80 | — | 0.25–0.35 | — | 0.025 | 0.015 |
| 15CrMoG | 0.12–0.18 | 0.17–0.37 | 0.40–0.70 | 0.80–1.10 | 0.40–0.55 | — | 0.025 | 0.015 |
Mechanical Properties
| Grade | Tensile Strength Rm, MPa | Yield Strength ReL / Rp, MPa Min | Elongation A Longitudinal, % Min | Elongation A Transverse, % Min | Impact Energy KV2 Longitudinal, J Min | Impact Energy KV2 Transverse, J Min |
|---|---|---|---|---|---|---|
| 20G | 410–550 | 245 | 24 | 22 | 40 | 27 |
| 20MnG | 415–560 | 240 | 22 | 20 | 40 | 27 |
| 16Mn | 490–670 | 320 | 21 | 19 | 40 | 27 |
| 15MoG | 450–600 | 270 | 22 | 20 | 40 | 27 |
| 15CrMoG | 440–640 | 295 | 21 | 19 | 40 | 27 |
TORICH Group, an one-stop service provider of raw materials engaged in raw material production, R&D and
trade, has 30+ years of experience in the market, exported to 56 +countries, and won good reputation and
credibility among domestic and foreign customers.
The company's production plant covers an area of over 10,000 square meters, with an annual production
capacity of 50,000 tons of materials and a comprehensive trading and warehousing capacity of 100,000 tons, which can satisfy customers' personalized needs for raw materials in terms of diversity and timeliness.
The group holds shares in more than ten domestic production entities, whose main products include
seamless steel pipes ( carbon steel and stainless steel), welded pipes ( carbon steel and stainless steel), pipe fittings ( carbon steel and stainless steel), titanium (titanium tubes, titanium rods, titanium cakes, titanium plates, etc.), aluminum (aluminum tubes, aluminum rods, aluminum die casting, aluminum casting, CNC machining), and CNC deep processing of metal materials such as tubes, rods, and casting parts.
Over the past 30 years, the company has been gradually developing new technologies and materials to meet
the growing needs of customers and various diversified needs, exporting to more than 56 countries and still
increasing the number of exporting countries, aiming to help customers to solve the demand for raw materials, and to facilitate one-stop purchasing for customers.
Q: Are you trading company or manufacturer ?
A: manufacturer,also can do trading.
Q: How long is your delivery time?
A: Generally speaking,it is 10-15 days if the goods are in stock,or it is 30-40 days if the goods are not in stock, it is according to quantity.
Q: Do you provide samples? is it free or extra ?
A: Yes, we could offer the sample for free charge but need pay the cost of freight.
Q: What is your terms of payment ?
A: Payment<=2000USD, 100% in advance. Payment>=2000USD, 30% T/T in advance ,balance before shippment.
If you have another question, pls feel free to contact with me.
Similar Products
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.
Company
TORICH INTERNATIONAL LIMITED
Location
Suite 1604-3, Hongan Plaza, #258 Die Yuan Road, Yinzhou District, Ningbo City, China
Contact Person
Richard SHEN