EN 10216-2 16Mo3 Seamless Steel Pipe

As a chromium-molybdenum(Cr-Mo) alloy steel, the EN 10216-2 16Mo3 seamless pipe is mainly utilized at elevated temperatures in oil refinery piping, steam pipeline, and power plant projects, etc. The steel number of grade 16Mo3 is 1.5415 which is an European designation. The relative ASTM equivalent is ASTM A335 Grade P1(also known as ASME SA335 Grade P1). The A335 P1 pipe is also used in high-temperature services which contains a bit higher molybdenum by mass.

1. EN 10216-2 16Mo3 chemical composition

Element	Content by Mass, %
Carbon (C)	0.12~0.20
Silicon (Si)	≤0.35
Manganese (Mn)	0.40~0.90
Phosphorus (P)	≤0.025
Sulfur (S)	≤0.020
Chromium (Cr)	≤0.30
Molybdenum (Mo)	0.25~0.35
Nickel (Ni)	≤0.30
Aluminium (Al)	≤0.040
Copper (Cu)	≤0.30

2. Mechanical properties of EN 10216-2 16Mo3(1.5415) seamless pipes

Yield Strength & Tensile Strength

Yield Strength for Wall Thickness T, Min. MPa			Tensile Strength MPa
T ≤ 16	16 < T ≤ 40	40 < T ≤ 60	-
280	270	260	450~600

T refers to wall thickness of the pipe. All values are minimum unless otherwise specified.

Elongation and Impact Properties

Elongation A min. %		Absorbed Energy KV Min. %
l	t	l at 20°C	t at 20°C
22	20	40	27

“l” refers to longitudinal while “t” refers to transverse of the pipe. All values are the minimum. Impact test(charpty test) shall be conducted at room temperature.

Temperature - Proof Strength Ratings

Minimum Proof Strength Rp0.2 at different temperatures, MPa
100 °C	150 °C	200 °C	250 °C	300 °C	350 °C	400 °C	450 °C	500 °C
243	237	224	205	173	159	156	150	146

3. Heat treatment conditions

The 16Mo3 / 1.5415 alloy steel pipe shall be normalized at a temperature between 890 °C and 950 °C and then be cooled in ambient temperature.