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PRODUCTION

EN 10217-2 hFW STEEL PIPES

EN 10217-2 WELD STEEL PIPE

About EN 10217-2

P stands for Pressure, GH stands for High Temperature, and these are special suffixes for the EN series of high-temperature pressure-resistant steel grades, distinguishing them from normal temperature pressure-resistant steel grades (TR suffix).

In 16Mo3, "16" represents a carbon content of approximately 0.16%, and "Mo3" represents a molybdenum content of approximately 0.3%, which is a typical naming convention for low-alloy high-temperature steel.

TC1 and TC2: TC1 has no mandatory impact requirement and is suitable for general operating conditions; TC2 must meet an impact energy of ≥27J at 0°C, making it suitable for low-temperature or high-safety requirement scenarios.

Chemical Composition

Non-alloy high-temperature steel grades (P series)

Chemical composition (cast analysis) in % by mass
Steel grade	C	Si	Mn	P	S	Cr	Mo	Ni	Al _tot	Cu	Nb	Ti	V	Cr+Cu+Mo+Ni ^b
Steel grade	max	max	max	max	max	max	max	max	min	max	max	max	max	max
P195GH	0.13	0.35	1.00	0.025	0.015	0.30	0.08	0.30	0.02	0.30	0.01	0.03	0.02	0.60
P235GH	0.16	0.35	1.20	0.025	0.020	0.30	0.08	0.30	0.02	0.30	0.01	0.03	0.02	0.60
P265GH	0.20	0.40	1.40	0.025	0.020	0.30	0.08	0.30	0.02	0.30	0.01	0.03	0.02	0.60

Low-alloy high-temperature steel grade (16Mo3)

Chemical composition (cast analysis) in % by mass

Steel grade

Al _tot

Ti+Nb+V

Cr+Cu+Mo+Ni ^b

max

min

max

16Mo3

0.18

0.35

1.20

0.025

0.015

0.30

0.25~0.35

0.30

0.02

0.30

0.01

0.03

0.02

0.03

0.60

Mechanical Properties

Steel grade	Mechanical properties for T ≤ 16
	Tensile properties at room temperature				Impact properties
	Upper yield strength or proof strength R_eH or R_p0.2	Tensile strength R_m	Elongation A min. % ^{a b}		Minimum average absorbed energy ^b KV₂ ^c J at a temperature of ℃
	Min / MPa	MPa	longitudinal	transverse	longitudinal		transverse
	Min / MPa	MPa	longitudinal	transverse	0℃	-10℃	0℃
P195GH	195	360 ~ 510	28	25	40	28	27
P235GH	235	360 ~ 510	26	23	40	28	27
P265GH	265	410 ~ 570	24	21	40	28	27

As the temperature increases, the strength of EN 10217-2 decreases, and it is important to understand this change for the safety of piping that is often used in high-temperature and high-pressure environments. The change in P195GH is shown below:

Steel grade	Proof strength R_p0.2 MPa, min at a temperature of ℃
Steel grade	100℃	150℃	200℃	250℃	300℃	350℃	400℃
P195GH	175	165	150	130	113	102	94
P235GH	198	187	170	150	132	120	112
P265GH	226	213	192	171	154	141	134

Steel grade	Mechanical properties for T ≤ 16
	Tensile properties at room temperature				Impact properties
	Upper yield strength or proof strength R_eH or R_p0.2	Tensile strength R_m	Elongation A min. % ^{a b}		Minimum average absorbed energy ^b KV₂ ^c J at a temperature of ℃
	Min / MPa	MPa	longitudinal	transverse	longitudinal	transverse
					20℃	20℃
16Mo3	280	450 – 600	22	20	40	27

Minimum 0,2% proof strength (R_p0.2) at elevated temperature for wall thickness T≤16 mm:

Steel grade	R_p0.2 min MPa at a temperature of ℃
Steel grade	100	150	200	250	300	350	400
16Mo3	243	237	224	205	173	159	156

product applicant and tolerance

01.applicant Field :

P195GH: Low-pressure, high-temperature pipelines (such as HVAC hot water pipes and small boiler auxiliary pipes), suitable for basic pressure scenarios at low pressure and from normal to medium temperatures, cost-effective and highly versatile.

P235GH: The main piping of boilers, pressure vessels, and heat exchangers, it is the primary steel grade for medium-low pressure and high-temperature conditions, suitable for conventional pressure-bearing equipment in industries such as power plants, chemical, and pharmaceutical.

P265GH: Medium to high pressure high-temperature pipelines (such as industrial boiler superheaters and steam pipelines), with higher strength, suitable for harsh conditions with high pressure and high temperature, commonly used in large power plants and industrial heating systems.

16Mo3: Under high temperature and high pressure conditions (such as main steam pipelines in power plants and high-temperature pipelines in refineries), the molybdenum element enhances high-temperature strength and creep resistance, making it suitable for long-term high-temperature pressurized scenarios above 500°C.

02.Tolerance:

Pipe lengths: Pipes with precise lengths are manufactured with the following tolerance values: For D406,4- for pipes 0- 6m -0/+25%- for pipes 6-12m -0/+50%- for pipes longer than 12m -0/to be negotiated.
Tightness: Pipes should be subject to water testing (7Mpa) or electromagnetic testing..
Straightness: < 0,0015 of pipe length (below 3mm per every meter of pipe length).
Mandatory tests:

TC1 – Ladle analysis, tensile testing, flattening test, resilience testing, tightness testing, dimension verification, visual inspection, NDT of the weld, material identification for 16Mo3 steel
TC2 - Ladle analysis, tensile testing, flattening test, resilience testing, tightness testing, dimension verification, visual inspection, NDT of the weld, NDT of the pipe body, material identification for 16Mo3 steel

Optional tests: Final product analysis, tensile testing in elevated temperature, tensile testing of the weld in room temperature, resilience testing, longitudinal resilience testing, wall thickness measurement at a distance from pipe ends, NDT in order to identify longitudinal discontinuity and delamination.