9CrMo1 UNS K90941 – Martensitic Alloy Steel

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9CrMo1 UNS K90941 – Martensitic Alloy SteelHarris Lee2026-06-01T08:40:05+00:00

1. Introduction

9CrMo1 (UNS K90941) is a ferritic Cr-Mo alloy steel with ~9 % Cr and ~1 % Mo. It delivers superior high-temperature strength, oxidation resistance to 650 °C, and excellent creep resistance. Primary markets are power generation (boiler and steam systems) and petrochemical refining (high-pressure, high-temperature process piping).

9CrMo1 alloy steel stacked in warehouse — 9CrMo1 (UNS K90941) alloy steel

2. Equivalent Grades

Standard	Grade / Designation	Material No.
ASTM A213 / A335	T9 / P9	UNS K90941
ASTM A234 / A182	WP9 / F9	UNS K90941
EN 10216-2	X12CrMo9-1	1.7386
DIN 17175	X8CrMo9-1	—
JIS G3462 / G3458	STBA26 / STPA26	—
GOST 550	12Х9М	—
BS 3059 / 3604	Grade 629-470	—

3. Applications

Power Generation

Superheater tubes, reheater tubes, main steam headers, steam manifolds, boiler drums, high-pressure steam pipelines, turbine casing components.

Petrochemical & Refining

Catalytic cracker transfer lines, hydrocracker piping, furnace radiant tubes, heat exchanger shells & bundles, high-pressure reactor nozzles, valve bodies, flanges.

4. Supply Forms & Sizes

Round BarØ 6 – 500 mm

Flat BarT 4–150 mm, W ≤ 600 mm

Plate / SheetT 3 – 200 mm

Seamless Tube / PipeOD 10 – 610 mm

Wire / Rod CoilØ 0.5 – 12 mm

5. Chemical Composition

Per ASTM A213 / A335 Grade 9 — wt %

C	Mn	Si	Cr	Mo	P max	S max
0.05–0.15	0.25–0.60	0.25–1.00	8.00–10.00	0.90–1.10	0.025	0.025

6. Mechanical Properties

Condition / Standard	UTS (MPa)	YS 0.2% (MPa)	Elong. (%)	Hardness
N+T — ASTM A213 T9	≥ 415	≥ 205	≥ 30	≤ HB 217
N+T — ASTM A335 P9	≥ 415	≥ 205	≥ 30	≤ HB 217
N+T — EN X12CrMo9-1	590–740	≥ 390	≥ 20	≤ HB 220

N+T = Normalize 1040–1080 °C + Temper 730–790 °C (air or water cool).

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