ASTM A268 TP420 Boiler And Heat Exchanger Tube
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GNEE is a well-known manufacturer, exporter, distributor, stockist and supplier of stainless steel heat exchanger tubes and condenser tubes. Our products comply with domestic and international raw material quality standards.
Our ASTM A268 TP420 is a martensitic stainless steel tube (UNS S42000) designed for boilers and heat exchangers, fully compliant with the ASTM A268 standard as well as boiler and pressure vessel material standards. Compared with traditional materials, it can extend the service life of boiler and heat exchanger components by over 50%.
The continuous service temperature of ASTM A268 TP420 stainless steel round tubes reaches up to 600℃, which can maintain structural stability even under the long-term high-temperature and high-pressure conditions of boiler flue gas and heat transfer media (with an operating pressure up to 8 MPa). Its yield strength ≥345 MPa and tensile strength ≥520 MPa are 40% and 30% higher than those of ordinary carbon steel tubes respectively, effectively resisting deformation caused by thermal expansion and contraction during equipment startup and shutdown.
In a saturated steam environment (180℃, 1 MPa), its corrosion rate is as low as ≤0.03 mm/year. Far lower than the 0.15 mm/year of carbon steel tubes, ASTM A268 TP420 stainless steel boiler tubes effectively prevent the risks of tube wall thinning and leakage. These steel tubes feature excellent thermal fatigue resistance, capable of withstanding no less than 500 cycles of rapid temperature changes (from 600℃ to room temperature) without cracking. With a smooth inner wall (surface roughness Ra ≤1.6 μm), they can reduce fluid resistance by 15% and improve heat exchange efficiency by 8%–10% compared with ordinary steel tubes.
A268 SS 420 Seamless Tube TP420 Stainless Steel Welded Tube specification
| Outside Diameter | 6-203mm |
| Wall Thickness | 0.5-25mm |
| Length | Up to 25m |
| Standard | ASTM A268, ASME SA268 |
| Grade | TP410/TP405/TP420/TP430/TP430Ti/TP403/TP409/TP444/TP439/TP446,etc. |
| Delivery Condition | Pickled, Polished, Bright Annealed |
| Technique | Seamless/Welded |
| Application | Heat Exchanger, Heater, Condenser, Machining, Bearing Machining, API Service… |
| Marking | LOGO, Standard, Grade, Size, Heat Number. |
| Package | Woven bag, wooden case, or as per customer's requirement. |
| Quality Requirement | Mill Test Certificate (EN 10204/3.1); Third Part Inspection is acceptable. |
ASME SA240 420 Tube Chemical Composition (%)
| C | Mn | P | S | Si | Ni | Cr | other |
| 0.15--0.4 | 1.00 Max. | 0.040 Max. | 0.030 Max. | 1.00 Max. | 0.75 Max | 12.0 – 14.0 | / |
| 0.44 | 1.00 Max. | 0.040 Max. | 0.030 Max. | 1.00 Max. | 0.75 Max | 12.0 – 14.0 | / |
ASTM A268 ASME SA268/SA268M 420 TUBE Mechanical Properties
| Material Grade | Matrial Number | Tensile Strength | Yield Strength | Elongation | Brinell Hardness | Rockwell Hardness |
| Rm | Rp0.2% | (%) | HBW max | HRC max | ||
| N/mm² ksi(MPa) | N/mm² (MPa) | |||||
| min | min | |||||
| 420 | S42000 | 85 (586) | 45 (310) | 29 | / | 53--57 |
| 420HC | S42000HC | 87 (600) | 45 (310) | 28 | / | 56--59 |
Applications of ASTM A268 TP420 stainless steel pipes
ASTM A268 TP420 (Type 420) stainless steel boiler and heat exchanger tubes are suitable for applications requiring high strength, high hardness, and high wear resistance. They are commonly used in condensers, feedwater heaters, and boilers in power plants, as well as in the petrochemical and other industrial sectors.
When inquiring about ASTMA268 TP420 seamless tubes from a supplier, please be sure to provide/request the following information:
Outer diameter (OD), wall thickness, length (single random or double random)
Grade: TP420 / UNS S42000 / 1.4021 (confirm if it meets your specifications)
Surface treatment: Bright annealed, pickled and annealed, cold drawn, etc.
Certification: Mill test certificate (e.g., EN10204/3.1), third-party inspection report available upon request
Surface condition and end treatment (plain end, beveled end)
Quantity (tons or pieces) and delivery terms (FOB, CIF, etc.)
Packaging requirements (wooden crates, bundling, etc.)
Delivery time and shipping port.
*Test Certificates: Factory test certificate, third-party inspection report, and raw material certificate
Delivery Time: In-stock items ship immediately, customized products have a delivery time of 15-30 days
*Value-added Services: Pre-treatment, parts cutting, third-party inspection, sample service, ultrasonic testing, and dimensional inspection
