16Mo3 (1.5415, UNS K11820) is a Cr-Mo alloy steel for boiler and pressure tubes, service up to ~600 °C, supplied as seamless tube to EN 10216-2. GNEE STEEL offers OD 10.2–711 mm, wall 1.6–100 mm, length 5.8/6/11.8 m or random, normalized or normalized+tempered. Confirm size and heat treatment with GNEE STEEL.
Seamless Boiler Tube
16Mo3, also listed as material number 1.5415 and UNS K11820, is a chromium-molybdenum alloy steel built for elevated-temperature and high-pressure service - which is exactly why it is the standard choice for boiler tubes, superheater tubes, pressure vessels, and piping in power plants and refineries. The molybdenum and chromium give the steel creep resistance and protection against hydrogen attack and graphitization at temperatures up to about 600 °C, so it holds strength where plain carbon steel would soften and fail.
The old DIN 17175 standard that once covered this grade has been largely replaced by EN 10216-2 for seamless tubes; when a buyer specifies 16Mo3 today, the deliverable is normally a seamless boiler tube to EN 10216-2, supplied in the normalized or normalized-and-tempered condition. The purchasing decisions that actually matter are the outside diameter and wall thickness for your pressure rating, the heat-treatment state, and proof that the tube meets the high-temperature mechanical requirements on paper - not just a "chrome-moly" label.
Specifications
| Item | Parameter | Value (or confirm with GNEE STEEL) |
| 1 | Grade | 16Mo3 (material 1.5415, UNS K11820) |
| 2 | Standard | EN 10216-2 (seamless alloy steel tubes for pressure); replaced DIN 17175 |
| 3 | Type | Seamless boiler / pressure tube |
| 4 | OD range | 10.2–711 mm |
| 5 | Wall thickness | 1.6–100 mm |
| 6 | Length | 5.8 m, 6 m, 11.8 m, or random |
| 7 | Heat treatment | Normalizing, quenching+tempering, normalizing+tempering |
| 8 | Service temperature | Up to approx. 600 °C (confirm per design) |
| 9 | MTC | EN 10204 3.1 Mill Test Certificate provided |
Applications
Because 16Mo3 keeps usable strength and creep resistance at high temperature, it is specified wherever the tube sees sustained heat and pressure. Power-plant boilers and superheaters are the classic use; the same grade appears in refinery heater coils, petrochemical reformers, and hydrogen-service piping where resistance to decarburization matters. Pressure-vessel fabricators use it for shells and nozzles that operate hot.
The alloy's chrome content also slows oxidation and scaling on the tube surface, extending life in fired environments. The limit is very low temperature - 16Mo3 is not a cryogenic grade, so for cold-service lines a different material (such as an A333 low-temperature grade) is required. In practice, a buyer matches 16Mo3 to the design metal temperature and pressure, then confirms the heat-treatment condition and any impact or high-temperature proof tests the code demands.
Procurement & Ordering
For a quote, give GNEE STEEL the standard (EN 10216-2), grade (16Mo3), OD and wall (or nominal size and schedule), length, end finish, heat-treatment state, and any additional tests (impact, hardness, ultrasonic, hydro). MOQ and lead time depend on whether the size is stock or rolled to order - alloy boiler tube is usually made to order, so confirm lead time early. Packaging is seaworthy bundling with end caps and protection for sea transport.
Quality documentation centers on the EN 10204 3.1 MTC plus the required high-temperature test reports; third-party inspection by SGS or BV can be arranged at buyer cost. Shipment leaves from Tianjin, Qingdao, Shanghai, or Ningbo (confirm port), FOB or CIF. Because alloy tube is specification-critical, insist on full traceability and do not accept off-grade substitution. If 16Mo3 is unavailable short-term, GNEE STEEL can discuss alternatives such as 13CrMo4-5 (P11 class) or 10CrMo9-10 (P22 class) - but each has different Cr-Mo content and temperature limits, so verify against your design code before substituting.
Packaging and Shipping
FAQ
Q: Is 16Mo3 the same as P11 or P22?
A: No. 16Mo3 is roughly a 0.5Mo grade; P11 is 1.25Cr-0.5Mo and P22 is 2.25Cr-1Mo, with higher temperature/pressure capability. Confirm the exact alloy your code requires with GNEE STEEL.
Q: Which standard applies now - DIN or EN?
A: DIN 17175 is largely superseded by EN 10216-2 for seamless tubes. Order to EN 10216-2 unless your project specifically calls for the old DIN grade.
Q: What heat treatment do you supply?
A: Normalized, normalized+tempered, or quenched+tempered, per your specification. Confirm the condition so the mechanical properties match the design.
Q: Do you provide MTC and inspection?
A: Yes, EN 10204 3.1 MTC plus required tests, and SGS/BV inspection can be arranged. Confirm test scope at order time.
Q: What sizes are typical?
A: OD 10.2–711 mm and wall 1.6–100 mm are available; lengths 5.8/6/11.8 m or random. Send your exact requirement for stock/lead-time confirmation.
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