DIN standard 17MN4 pressure vessel steel Plate

DIN 17Mn4 (also written as 17MN4) is a low-alloy high-strength steel plate designed for boiler and pressure vessel applications, standardized under DIN 17155. Below are its key specifications and characteristics:

1. Standard & Classification

Primary Standard: DIN 17155

Material Number: 1.0481 (DIN) / 1.0484 (EN)

Classification: Pressure vessel steel for high-temperature and high-pressure environments (e.g., boilers, reactors, storage tanks) .

2. Chemical Composition (Max %)

Element	C	Mn	Si	P	S	Al	Cr	Mo
Content	0.14–0.22%	0.90–1.60%	0.30–0.60%	≤0.035%	≤0.030%	≥0.020%	≤0.25%	≤0.10%
Other trace elements: Cu ≤0.30%, Nb ≤0.01%, Ni ≤0.30%, Ti ≤0.03%, V ≤0.03% .

3. Mechanical Properties

Room Temperature

Thickness (mm)	Yield Strength (MPa)	Tensile Strength (MPa)	Elongation (%)	Impact Energy (KVJ, min)
≤16	≥295	460–580	≥21	40 (at 20°C)
16–40	≥285	460–580	≥21	34 (at 0°C)
40–60	≥280	460–580	≥21	34 (at -20°C)
60–100	≥255	450–570	≥20	–

Elevated Temperature :

0.2% Yield Strength (min):

200°C: 235 MPa

300°C: 175 MPa

400°C: 135 MPa

4. Key Performance Features

High Strength & Toughness: Balances tensile strength (≥460 MPa) with elongation (≥20%) .

Wear/Corrosion Resistance: Suitable for abrasive environments (e.g., mining equipment) .

Weldability: Low carbon equivalent (Ceq ≈ 0.40–0.45%) enables easy welding with preheating (150–200°C) .

Fatigue & Impact Resistance: Critical for pressure vessels under cyclic loads .

5. Applications

Pressure Vessels: Reactors, heat exchangers, separators.

Energy & Power: Boiler steam drums, nuclear reactor pressure shells, turbine volutes.

Storage Tanks: Oil/gas tanks, liquefied gas cylinders.

Infrastructure: Water pipeline systems, hydroelectric turbine casings.

6. Equivalent Grades

Region	Equivalent Standard	Grade
Europe	EN 10028-2	P310NB
USA	ASTM	A515 Gr.65
Japan	JIS	SPV 315 / SB450
France	NF	A48 AP/CP/FP

Conclusion

DIN 17Mn4 steel is a robust, weldable pressure vessel material optimized for high-stress, high-temperature environments. Its balanced chemistry (Mn-dominated, low S/P) and normalized microstructure ensure reliability in critical infrastructure like boilers, reactors, and energy systems. For projects requiring DIN 17155 compliance, 17Mn4 offers a cost-effective alternative to pricier alloys like 15Mo3 or 13CrMo44

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