DIN 17176 Seamless Circular Steel Tubes for Hydrogen Service at Elevated Temperature and Pressure

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DIN17176 Seamless circular steel tubes for hydrogen service at elevated temperatures and pressures 

1.Field of application

This standard specifies requirements for seamless circular tubes manufactured from the steel grades.Such tubes are mainly intended for use in chemical plants for high pressure applications at service temperatures of 200oC or more and simultaneous exposure to hydrogen(e.g.boiler or heat exchanger tubes)

2.Concept

Steel for hydrogen service at elevated temperature and pressure is steel that is not readily susceptible to decarburization by hydrogen at elevated pressures and temperatures and thus to hydrogen and grain boundary embrittlement.this characteristic is achieved by adding alloying elements that from carbides at the operating temperature.

Grade	Material number	C	Si	Mn	P max	S max	Cr	Mo	Ni	V	Others
25CrMo4 1) 13CrMo4 4 10CrMo9 10 12CrMo9 10 12CrMo12 10 12CrMo19 5 X12CrMo9 1 20CrMoV13 5 X20CrMoV12 1	1.7216 1.7335 1.7380 1.7375 1.7381 1.7362 1.7386 1.77791.4922	0.22-0.29 0.10-0.18 2) 0.08-0.15 0.10-0.15 0.06-0.15 0.08-0.15 0.07-0.15 0.07-0.23 0.17-0.23	≤0.40 0.10-0.35 ≤0.50 ≤0.30 ≤0.50 ≤0.50 0.25-1.00 0.15-0.35 ≤0.50	0.60-0.90 0.40-1.00 0.40-0.70 0.30-0.80 0.30-0.60 0.30-0.60 0.30-0.60 0.30-0.50 ≤1.00	0.035 0.025 0.025 0.015 0.025 0.025 0.025 0.025 0.025	0.030 0.020 0.020 0.015 0.020 0.020 0.020 0.020 0.020	0.90-1.20 0.70-1.10 2.0-2.5 2.0-2.5 2.65-3.35 4.0-6.0 8.0-10.0 3.0-3.3 10.0-12.50	0.15-0.30 0.40-0.65 0.90-1.20 0.90-1.10 0.80-1.06 0.45-0.65 0.90-1.10 0.50-0.60 0.80-1.20	- - - <0.30 - - - - 0.30-0.80	- - - - - - - 0.45-0.55 0.25-0.35	Al≥0.010,Cu<0.20
1)At the manufacturer’s discretion,grade 24CrMo5,material number 1.71258,may be substituted for grade 25 CrMo 4 2)For wall thicknesses not less than 30 mm,the carbon content may be up to 0.02% higher.

DIN 17176 Seamless Circular Steel Tubes for Hydrogen Service at Elevated Temperature and Pressure