Steels for the manufacture of simple pressure vessels

Usage

These steel grades are characterized 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. DE FR IT GB FK1)
EN 10207 DIN EN 10207 (1992) 2) 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 164-400 LT20 A
P275SL 1.1100 SPH 275 - - - A
  1. FK = Tensile strength class, see dimensions
  2. invalid standard

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

Grade C Si Mn P S Altotal1) N
max. max. max. max. min. max.
P235S 0.16 0.35 0,40 - 1,20 0.025 0.025 0.020 0.010
P265S 0.20 0.40 0,50 - 1,50 0.025 0.025 0.020 0.010
P275SL 0.16 0.40 0,50 - 1,50 0.025 0.020 0.020 0.010
  1. The minimum aluminum content does not apply if the steel contains sufficient quantities of other nitrogen-fixing elements.

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 ≤ 40 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.

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 normalized 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.