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Home > Products > Hot-rolled products > Steel grades > Steels for the manufacture of simple pressure vessels

Steels for the manufacture of simple pressure vessels

Usage

These steel grades are characterised by a minimum yield strength of 235 - 275 MPa and by good weldability. The user of these steel grades must make sure that his calculation, design and processing methods are appropriate for the material.

Standards

Europe	Material no.	D	F	I	GB	FK¹⁾
EN 10207		DIN EN 10207 (1992)	NFA 36-205	UNI 5869	BS 1501
P235S	1.0112	SPH 235	A 37 AP	Fe 360-2KW	164-360B LT20	A
P265S	1.0130	SPH 265	A 42 AP	Fe 410-2KW	164-400B LT20	A
P275SL	1.1100	SPH 275	-	-	-	A

¹⁾ FK = Tensile strength class

Chemical composition in percent by weight [%] (Heat analysis)

Grade	C	Si	Mn	P	S	Al_total¹⁾
	max.	max.		max.	max.	min.
P235S	0.16	0.35	0.40 - 1.20	0.025	0.025	0.020
P265S	0.20	0.40	0.50 - 1.50	0.025	0.025	0.020
P275SL	0.16	0.40	0.50 - 1.50	0.025	0.020	0.020

¹⁾ The minimum aluminium content does not apply if the steel contains sufficient quantities of other nitrogen-fixing elements.

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Mechanical properties¹⁾

Grade	Min. yield strength²⁾		Min. yield strength	Min. total elongation²⁾ [%]
	MPa		MPa	L₀ = 80 mm		L₀ = 5,65 √S₀
	e ≤ 16	16 < e ≤ 16		2 < e ≤ 2,5	2,5 < e ≤ 3	e > 3
P235S	235	225	360 - 480	20	21	26
P265S	265	255	410 - 530	17	18	22
P275SL	275	265	390 - 510	19	20	24

¹⁾ Longitudinal samples
²⁾ e = Nominal thickness in mm

Yield point at elevated temperature

Grade	Min. 0,2 % yield point in MPa at elevated temperature in °C
	100	150	200	250	300
P235S	171	162	153	135	117
P265S	194	185	176	158	140
P275SL	221	203	176	159	132

Notch impact energy

If agreed in the order, the notch impact energy is proved using longitudinal samples at -20 °C. The average notch impact energy from 3 samples must be 28 J minimum.
One individual value may fall short of the required minimum value by not more than 30 %. The sample width shall equal the product thickness if the latter is between 5 and 10 mm, the tests being performed using samples which are similar to Charpy-V samples. The required minimum values are to be reduced proportionally to the sample width.

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Welding

The steel grades of the P245NB - 275SL series may be welded using the usual welding techniques.

The steel grades of the P245NB - 275SL testing and certificate

The products are delivered in a condition obtained by normalised rolling. The provisions of EN 10207 shall apply for delivery and inspection.

Certificates according to DIN EN 10204 can be supplied as follows: IT, DUN, FAX, e-mail, paper.

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