Special steel grades for gas cylinders and gas vessels
Usage
These steel grades are characterized by a minimum yield strength of 245 - 355 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. The steel grades of this series are used for manufacturing gas cylinders by welding cold-formed parts together and normalizing the finished cylinder.
Standards
| Europe | Material no. | D | F | I | GB | J | FK1) |
| EN 10120 | DIN 17155 | NFA 36-211 | UNI 7355 | BS 5045 | JIS G 3116 | ||
| P245NB | 1.0111 | H I | BS 1 | Fe E 24 KR | Type A | SG 255 | A |
| P265NB | 1.0423 | H II | BS 2 | Fe E 27 KR | Type B | SG 295 | A |
| P310NB | 1.0437 | 17 Mn 4 | BS 3 | Fe E 31 KR | Type C | SG 325 | B |
| P355NB | 1.0557 | 19 Mn 6 | BS 4 | Fe E 35 KR | Type E | SG 365 | B |
Chemical composition in percent by weight [%] (Heat analysis)
| Grade | C | Si | Mn | P | S | N2) | Altotal1) | Ti | Nb |
| max. | max. | min. | max. | max. | max. | min. | max. | max. | |
| P245NB | 0.16 | 0.25 | 0.30 | 0.025 | 0.015 | 0.009 | 0.020 | 0.03 | 0.050 |
| P265NB | 0.19 | 0.25 | 0.40 | 0.025 | 0.015 | 0.009 | 0.020 | 0.03 | 0.050 |
| P310NB | 0.20 | 0.50 | 0.70 | 0.025 | 0.015 | 0.009 | 0.020 | 0.03 | 0.050 |
| P355NB | 0.20 | 0.50 | 0.70 | 0.025 | 0.015 | 0.009 | 0.020 | 0.03 | 0.050 |
Mechanical properties1)
| Grade | Min. yield strength | Tensile strength | Min. total elongation2) [%] | |
| MPa | MPa | L0 = 80 mm | L0 = 5,65 √S0 | |
| e < 3 | 3 ≤ e ≤53) | |||
| P245NB | 245 | 360 - 450 | 26 | 34 |
| P265NB | 265 | 410 - 500 | 24 | 32 |
| P310NB | 310 | 460 - 550 | 21 | 28 |
| P355NB | 355 | 510 - 620 | 19 | 24 |
Welding
The steel grades of the P245NB - P355NB series may be welded using the usual welding techniques.
Condition of delivery, scope of testing and certificate
The provisions of EN 10120 shall apply for delivery and inspection.
Certificates according to DIN EN 10204 can be supplied as follows: IT, DUN, FAX, e-mail, paper.