20G Non-Alloy Seamless Steel Omega Tube for High-Pressure Boiler Service with Cold-Drawn Process
Price:
800-1000 USD/Ton
MOQ:
1Ton
Delivery Time:
20-30days upon products
Brand:
TORICH
Product Description
20G Non Alloy Seamless Special Steel Pipe Omega Tube For Boilers
Product Overview
20G non-alloy seamless omega tube is a cold-drawn special-profile boiler tube developed for high-temperature pressure service where dimensional stability, heat-transfer efficiency, and shape consistency are critical. The base material is 20G under GB/T 5310, a recognized boiler-tube steel used for high-pressure boiler and other elevated-temperature pressure equipment.
Specifications
| Material | 20G non-alloy carbon steel |
| Standard | GB/T 5310 for high-pressure boiler seamless steel tubes |
| Comparable grades | ASTM A192, ASTM A210 Gr.A1, EN 10216-2 P235GH, JIS G 3461 STB340 |
| Tube form | Omega / special shaped seamless tube |
| Outside size range | Equivalent blank tube OD 5-420 mm; shaped section produced according to drawing |
| Wall thickness | 0.5-50 mm |
| Length | 1-12 m, customizable |
| Tolerance range | To drawing; cold-drawn process selected for tighter dimensional control |
| Straightness | By agreement / according to drawing requirement |
| Surface condition | Pickled, oiled, bright annealed, or normalized clean surface, depending on order |
| Heat treatment | Normally normalized for 20G; final condition according to applicable standard and drawing |
| Manufacturing route | Seamless tube → cold drawing / cold forming to omega profile → heat treatment → dimensional calibration → inspection |
| Supply condition | Bundles or custom packing |
Key Features
- Boiler-grade chemistry: 20G under GB/T 5310 is specified at C 0.17-0.23%, Si 0.17-0.37%, Mn 0.35-0.65%, P ≤0.025%, S ≤0.015%, designed for pressure service at elevated temperature.
- Reliable strength level: In normalized condition, 20G requires tensile strength 410-550 MPa, yield strength at least 245 MPa, elongation at least 24%.
- Cold-drawn seamless route: Improves profile precision, geometry control, cleaner surface, and more repeatable section dimensions.
- Heat-transfer optimization: Omega tubes improve heat-transfer layout efficiency in compact boiler assemblies.
Our Advantages
- Grade selection matched to boiler duty: We specify 20G to GB/T 5310 for high-pressure boiler tubes and high-temperature pressurized equipment.
- Comprehensive inspection package: Addresses pressure integrity, hidden defects, and forming damage with flattening, flaring, hardness, hydrostatic testing, and nondestructive tests.
- Functional heat treatment and surface control: Normalized delivery condition, controlled heat treatment, and clean post-drawing surface quality ensure elevated-temperature performance and service life.
Execution Standards
| GB | GB/T 5310 - seamless steel tubes for high-pressure boiler |
| ASTM / ASME | ASTM A192 / ASME SA-192 - seamless carbon steel boiler and superheater tubes; ASTM A210 / ASME SA-210 - seamless medium-carbon steel boiler and superheater tubes |
| EN | EN 10216-2 - seamless steel tubes for elevated-temperature service |
| JIS | JIS G 3461 - carbon steel boiler and heat exchanger tubes |
Application
Power-station boiler heat-exchange coil using omega-profile water-wall / superheater tube modules. The omega section helps optimize compact heat-transfer layout while retaining seamless pressure-bearing tube integrity.
Chemical Composition
| Grade | Standard | C (%) | Si (%) | Mn (%) | P (%) | S (%) |
|---|---|---|---|---|---|---|
| 20G | GB/T 5310 | 0.17-0.23 | 0.17-0.37 | 0.35-0.65 | ≤0.025 | ≤0.015 |
| 20 | GB/T 3087 | 0.17-0.24 | 0.17-0.37 | 0.35-0.65 | ≤0.035 | ≤0.035 |
| ASTM A192 | ASTM A192 / ASME SA-192 | max 0.06 | -- | 0.27-0.63 | ≤0.035 | ≤0.035 |
| ASTM A210 Gr.A1 | ASTM A210 / ASME SA-210 | ≤0.27 | ≥0.10 | ≤0.93 | ≤0.035 | ≤0.035 |
| P235GH | EN 10216-2 | ≤0.16 | ≤0.35 | 0.40-1.20 | ≤0.025 | ≤0.015 |
Mechanical Properties
| Grade | Standard | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) |
|---|---|---|---|---|
| 20G | GB/T 5310 | 410-550 | ≥245 | ≥24 |
| 20 | GB/T 3087 | 410-550 | ≥245 | ≥24 |
| ASTM A192 | ASTM A192 / ASME SA-192 | ≥325 | ≥180 | ≥35 |
| ASTM A210 Gr.A1 | ASTM A210 / ASME SA-210 | ≥415 | ≥225 | ≥30 |
| P235GH | EN 10216-2 | 360-500 | ≥235 | ≥25 |
Product Images
Frequently Asked Questions
Are you trading company or manufacturer?
Manufacturer, also can do trading.
How long is your delivery time?
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, according to quantity.
Do you provide samples? Is it free or extra?
Yes, we could offer the sample for free charge but need pay the cost of freight.
What is your terms of payment?
Payment ≤ 2000USD, 100% in advance. Payment ≥ 2000USD, 30% T/T in advance, balance before shipment. If you have another question, please feel free to contact with me.
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Get in Touch
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Company
TORICH INTERNATIONAL LIMITED
Location
Suite 1604-3, Hongan Plaza, #258 Die Yuan Road, Yinzhou District, Ningbo City, China
Contact Person
Richard SHEN