|
| MOQ: | 1 tấn |
| giá bán: | 800-1000 USD/Tons |
| bao bì tiêu chuẩn: | Trong bó hoặc trong hộp gỗ. |
| Thời gian giao hàng: | 20-30 ngày sau khi sản phẩm |
| phương thức thanh toán: | L/C, D/A, D/P, T/T, Western Union, MoneyGram |
| khả năng cung cấp: | 60000 tấn/tấn mỗi năm |
GB/T 20409 20G seamless multi-rifled steel tubes are internally ribbed boiler tubes designed for high-pressure boiler water-wall service. Compared with plain bore boiler tubes, the internal rifling promotes spiral flow of the steam-water mixture, helping maintain a water film on the inner wall under high heat flux conditions. 20G is a carbon boiler steel grade commonly used under GB/T 5310 material requirements, offering a tensile strength range of 410–550 MPa, minimum yield strength of 245 MPa, and minimum elongation of 24%.
| Item | Description |
|---|---|
| Material | Carbon boiler steel |
| Standard | GB/T 20409 |
| Material reference standard | GB/T 5310 |
| Grade | 20G |
| Tube type | Seamless multi-rifled steel tube |
| Outer diameter | Typical rifled boiler tube range: 22–82.6 mm; project range can be confirmed by drawing |
| Wall thickness | Typical range: 4.0–16.0 mm |
| Length | 1–12 m customizable; common supply lengths: 6 m, 9 m, 12 m |
| Rib form | Internal multi-rifled profile; common options include 4, 6, 8, 12 or 14 ribs, subject to drawing |
| Tolerance range | As per GB/T 20409 / GB/T 5310 and purchase drawing; tighter tolerance available after technical review |
| Straightness | Controlled for boiler-panel fabrication and automatic welding alignment |
| Surface condition | Bare, oiled, anti-rust coated, shot-blasted or pickled as required |
| Heat treatment | Normalized or normalized and tempered according to grade, wall thickness and purchase specification |
| Inspection | Chemical analysis, tensile test, dimensional inspection, surface inspection, NDT, hydraulic test or equivalent test as specified |
| Characteristic | Technical Detail |
|---|---|
| Pressure-grade material | 20G boiler steel: tensile strength 410–550 MPa, yield strength ≥245 MPa, elongation ≥24% |
| Internal rifling | Multi-rib inner profile creates spiral flow, improving water-wall wetting behavior compared with smooth bore tubes |
| Heat-transfer service | Designed for high-pressure boiler furnace water-wall tubes exposed to high heat flux |
| Seamless structure | No longitudinal weld seam, reducing weld-related weakness in high-pressure boiler operation |
| Impact requirement | For applicable sizes such as OD ≥76 mm and WT ≥14 mm, Charpy KV2 impact value is commonly specified at ≥40 J |
| Fabrication suitability | Suitable for bending, panel welding and membrane water-wall fabrication after material and dimensional confirmation |
| Professional Concern | Our Solution |
|---|---|
| Will the rifled profile match the boiler designer’s drawing? | We confirm rib number, lead angle, inner profile, OD, wall thickness and minimum wall thickness before production. Inspection can include profile section checking and dimensional reports. |
| Can the tubes maintain stable quality for water-wall panel fabrication? | We control straightness, OD tolerance, wall thickness consistency and surface condition to support automatic welding, tube bending and membrane panel assembly. |
| Is 20G the right material for the boiler condition? | We match GB/T 20409 tube requirements with GB/T 5310 material performance. If temperature, pressure or creep conditions exceed 20G’s typical range, we can review alternatives such as 15CrMoG or 12Cr1MoVG. |
| Standard System | Applicable Standard | Brief Description |
|---|---|---|
| GB | GB/T 20409 | Seamless multi-rifled steel tubes for high-pressure boiler |
| GB | GB/T 5310 | Seamless steel tubes and pipes for high-pressure boilers; material grades and mechanical requirements |
| ASTM / ASME | ASME SA-210 / ASTM A210 | Seamless medium-carbon steel boiler and superheater tubes; often used for comparable boiler applications |
| ASTM / ASME | ASME SA-213 / ASTM A213 | Seamless ferritic and austenitic alloy-steel boiler, superheater and heat-exchanger tubes |
| EN | EN 10216-2 | Seamless steel tubes for pressure purposes; non-alloy and alloy steel tubes with elevated temperature properties |
| JIS | JIS G3461 / JIS G3462 | Carbon steel and alloy steel boiler and heat exchanger tubes |
| GOST | GOST 8731 / GOST 8732 | Seamless hot-formed steel pipe technical and dimensional standards |
Specific application: furnace water-wall tube panels for high-pressure utility boilers.
| Grade | C % | Si % | Mn % | P max % | S max % | Cr % | Mo % | Cu max % | Ni max % | V % |
|---|---|---|---|---|---|---|---|---|---|---|
| 20G | 0.17–0.24 | 0.17–0.37 | 0.35–0.65 | 0.030 | 0.030 | ≤0.25 | ≤0.15 | ≤0.20 | ≤0.25 | ≤0.08 |
| 20MnG | 0.17–0.24 | 0.17–0.37 | 0.70–1.00 | 0.030 | 0.030 | ≤0.25 | ≤0.15 | ≤0.20 | ≤0.25 | ≤0.08 |
| 25MnG | 0.18–0.24 | 0.17–0.37 | 0.80–1.10 | 0.030 | 0.030 | ≤0.25 | ≤0.15 | ≤0.20 | ≤0.25 | ≤0.08 |
| 15CrMoG | 0.12–0.18 | 0.17–0.37 | 0.40–0.70 | 0.025 | 0.015 | 0.80–1.10 | 0.40–0.55 | ≤0.20 | ≤0.30 | ≤0.08 |
| 12Cr1MoVG | 0.08–0.15 | 0.17–0.37 | 0.40–0.70 | 0.030 | 0.030 | 0.90–1.20 | 0.25–0.35 | ≤0.20 | ≤0.30 | 0.15–0.30 |
| Grade | Tensile Strength MPa | Yield Strength MPa | Elongation % | Typical Heat Treatment |
|---|---|---|---|---|
| 20G | 410–550 | ≥245 | ≥24 | Normalized |
| 20MnG | ≥415 | ≥240 | ≥22 | Normalized |
| 25MnG | ≥485 | ≥275 | ≥20 | Normalized |
| 15CrMoG | 440–640 | ≥295 | ≥21 | Normalized + tempered |
| 12Cr1MoVG | 470–640 | ≥255 | ≥21 | Normalized + tempered or quenched + tempered, depending on wall thickness |
A: manufacturer,also can do trading.
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.
A: Yes, we could offer the sample for free charge but need pay the cost of freight.
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.
|
|
| MOQ: | 1 tấn |
| giá bán: | 800-1000 USD/Tons |
| bao bì tiêu chuẩn: | Trong bó hoặc trong hộp gỗ. |
| Thời gian giao hàng: | 20-30 ngày sau khi sản phẩm |
| phương thức thanh toán: | L/C, D/A, D/P, T/T, Western Union, MoneyGram |
| khả năng cung cấp: | 60000 tấn/tấn mỗi năm |
GB/T 20409 20G seamless multi-rifled steel tubes are internally ribbed boiler tubes designed for high-pressure boiler water-wall service. Compared with plain bore boiler tubes, the internal rifling promotes spiral flow of the steam-water mixture, helping maintain a water film on the inner wall under high heat flux conditions. 20G is a carbon boiler steel grade commonly used under GB/T 5310 material requirements, offering a tensile strength range of 410–550 MPa, minimum yield strength of 245 MPa, and minimum elongation of 24%.
| Item | Description |
|---|---|
| Material | Carbon boiler steel |
| Standard | GB/T 20409 |
| Material reference standard | GB/T 5310 |
| Grade | 20G |
| Tube type | Seamless multi-rifled steel tube |
| Outer diameter | Typical rifled boiler tube range: 22–82.6 mm; project range can be confirmed by drawing |
| Wall thickness | Typical range: 4.0–16.0 mm |
| Length | 1–12 m customizable; common supply lengths: 6 m, 9 m, 12 m |
| Rib form | Internal multi-rifled profile; common options include 4, 6, 8, 12 or 14 ribs, subject to drawing |
| Tolerance range | As per GB/T 20409 / GB/T 5310 and purchase drawing; tighter tolerance available after technical review |
| Straightness | Controlled for boiler-panel fabrication and automatic welding alignment |
| Surface condition | Bare, oiled, anti-rust coated, shot-blasted or pickled as required |
| Heat treatment | Normalized or normalized and tempered according to grade, wall thickness and purchase specification |
| Inspection | Chemical analysis, tensile test, dimensional inspection, surface inspection, NDT, hydraulic test or equivalent test as specified |
| Characteristic | Technical Detail |
|---|---|
| Pressure-grade material | 20G boiler steel: tensile strength 410–550 MPa, yield strength ≥245 MPa, elongation ≥24% |
| Internal rifling | Multi-rib inner profile creates spiral flow, improving water-wall wetting behavior compared with smooth bore tubes |
| Heat-transfer service | Designed for high-pressure boiler furnace water-wall tubes exposed to high heat flux |
| Seamless structure | No longitudinal weld seam, reducing weld-related weakness in high-pressure boiler operation |
| Impact requirement | For applicable sizes such as OD ≥76 mm and WT ≥14 mm, Charpy KV2 impact value is commonly specified at ≥40 J |
| Fabrication suitability | Suitable for bending, panel welding and membrane water-wall fabrication after material and dimensional confirmation |
| Professional Concern | Our Solution |
|---|---|
| Will the rifled profile match the boiler designer’s drawing? | We confirm rib number, lead angle, inner profile, OD, wall thickness and minimum wall thickness before production. Inspection can include profile section checking and dimensional reports. |
| Can the tubes maintain stable quality for water-wall panel fabrication? | We control straightness, OD tolerance, wall thickness consistency and surface condition to support automatic welding, tube bending and membrane panel assembly. |
| Is 20G the right material for the boiler condition? | We match GB/T 20409 tube requirements with GB/T 5310 material performance. If temperature, pressure or creep conditions exceed 20G’s typical range, we can review alternatives such as 15CrMoG or 12Cr1MoVG. |
| Standard System | Applicable Standard | Brief Description |
|---|---|---|
| GB | GB/T 20409 | Seamless multi-rifled steel tubes for high-pressure boiler |
| GB | GB/T 5310 | Seamless steel tubes and pipes for high-pressure boilers; material grades and mechanical requirements |
| ASTM / ASME | ASME SA-210 / ASTM A210 | Seamless medium-carbon steel boiler and superheater tubes; often used for comparable boiler applications |
| ASTM / ASME | ASME SA-213 / ASTM A213 | Seamless ferritic and austenitic alloy-steel boiler, superheater and heat-exchanger tubes |
| EN | EN 10216-2 | Seamless steel tubes for pressure purposes; non-alloy and alloy steel tubes with elevated temperature properties |
| JIS | JIS G3461 / JIS G3462 | Carbon steel and alloy steel boiler and heat exchanger tubes |
| GOST | GOST 8731 / GOST 8732 | Seamless hot-formed steel pipe technical and dimensional standards |
Specific application: furnace water-wall tube panels for high-pressure utility boilers.
| Grade | C % | Si % | Mn % | P max % | S max % | Cr % | Mo % | Cu max % | Ni max % | V % |
|---|---|---|---|---|---|---|---|---|---|---|
| 20G | 0.17–0.24 | 0.17–0.37 | 0.35–0.65 | 0.030 | 0.030 | ≤0.25 | ≤0.15 | ≤0.20 | ≤0.25 | ≤0.08 |
| 20MnG | 0.17–0.24 | 0.17–0.37 | 0.70–1.00 | 0.030 | 0.030 | ≤0.25 | ≤0.15 | ≤0.20 | ≤0.25 | ≤0.08 |
| 25MnG | 0.18–0.24 | 0.17–0.37 | 0.80–1.10 | 0.030 | 0.030 | ≤0.25 | ≤0.15 | ≤0.20 | ≤0.25 | ≤0.08 |
| 15CrMoG | 0.12–0.18 | 0.17–0.37 | 0.40–0.70 | 0.025 | 0.015 | 0.80–1.10 | 0.40–0.55 | ≤0.20 | ≤0.30 | ≤0.08 |
| 12Cr1MoVG | 0.08–0.15 | 0.17–0.37 | 0.40–0.70 | 0.030 | 0.030 | 0.90–1.20 | 0.25–0.35 | ≤0.20 | ≤0.30 | 0.15–0.30 |
| Grade | Tensile Strength MPa | Yield Strength MPa | Elongation % | Typical Heat Treatment |
|---|---|---|---|---|
| 20G | 410–550 | ≥245 | ≥24 | Normalized |
| 20MnG | ≥415 | ≥240 | ≥22 | Normalized |
| 25MnG | ≥485 | ≥275 | ≥20 | Normalized |
| 15CrMoG | 440–640 | ≥295 | ≥21 | Normalized + tempered |
| 12Cr1MoVG | 470–640 | ≥255 | ≥21 | Normalized + tempered or quenched + tempered, depending on wall thickness |
A: manufacturer,also can do trading.
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.
A: Yes, we could offer the sample for free charge but need pay the cost of freight.
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.
