ISO/TR 15608 Group 9.1 such as material 13MnNi6-3:
Nickel alloy steels with Ni ≤ 3,0 %
Nickel alloy steels ISO/TR 15608 Material Group 9.1 for Cryogenic and Low-Temperature Service
Low-temperature steels generally refer to steels applied below 0℃. The addition of Mn, Ni and other alloying elements can reduce interstitial impurities, refine grain, control the size, shape and distribution of the second phase, etc., so as to reduce the Ductile – Brittle transition temperature of ferrite steel. Alloying elements in low temperature steel mainly affect the low temperature toughness of steel. The low-temperature toughness of steel increased by Nickel is 5 times as much as that of manganese, and the brittle transition temperature decreased by about 10℃ for every 1% increase in nickel content, which is mainly due to the fact that nickel was not reacted with carbon and all dissolved into the solid solution to strengthen it.
Applications for material 13MnNi6-3 group 9.1 ISO/TR 15608
This material group retain adequate Charpy V-notch toughness, and thus high resistance to brittle fracture, even in the temperature range down to -105° C. This makes them the perfect choice for gas-liquefaction plants, for example, and for the transportation and storage of liquefied gases, such as LNG and LPG. The value of 27 joules with the Charpy V notch test is taken as the minimum value of the impact energy at the respective lowest service temperature.
Welding of low temperature steels
The characteristic properties of welding consumables for welding Low-Temperature steels is their deformation capacity at low temperatures, which is usually tested using the notched bar impact bending test. The value of the impact energy is used to draw conclusions about the tendency to brittle fracture and the suitability for use up to a certain temperature. When welding at low temperature steels, attention must be paid to controlled heat input in order to keep the heat-affected zone as narrow as possible and still avoid hardening peaks.
When welding nickel-alloyed steels, welding consumables of the same or similar type with 2.0 to 3.5% Ni are used. Weld filler metals of the same type are preferable if, in addition to the required minimum temperature, the mechanical-technological (strength, toughness) and physical (coefficient of thermal expansion) properties of the base material must be guaranteed in the weld metal.
Typical material in group 9.1
| Name/Grade | Number | Standards | Product | Remarks/Trade Mark |
|---|---|---|---|---|
| 11MnNi5-3 11MnNi5-3 | 1.6212 1.6212 | EN 10028-4 EN 10216-4 | Plate Seamless tube | EN 13445-2 & 13480-2 EN 13445-2 & 13480-2 |
| 13MnNi6-3 13MnNi6-3 13MnNi6-3 | 1.6217 1.6217 1.6217 | EN 10028-4 EN 10216-4 EN 10222-3 | Plate Seamless tube Forging | EN 13445-2 & 13480-2 EN 13445-2 & 13480-2 EN 13445-2 & 13480-2 |
| 15NiMn6 15NiMn6 15NiMn6 LF5 Cl. 1 LF5 Cl. 2 | – 1.6228 1.6228 K13050 K13050 | ISO 9328-4 EN 10028-4 EN 10222-3 ASTM A-350 ASTM A-350 | – Plate Forging Forging Forging | – EN 13445-2 & 13480-2 EN 13445-2 & 13480-2 ASME BPVC ASME BPVC |
| A | K21703 | ASTM A-203 | Plate | ASME BPVC |
| 7 7 | K21903 K21903 | ASTM A-333 ASTM A-334 | Smls. & welded pipe Welded tube | ASME BPVC ASME BPVC |
| FR WPR 9 9 WPL9 V V, E | K22035 K22035 K22035 K22035 K22035 K22035 K22035 | ASTM A-182 ASTM A-234 ASTM A-333 ASTM A-334 ASTM A-420 ASTM A-714 ASTM A-714 | Forging Fittings Smls. & welded pipe Welded tube Piping fitting Smls. & welded pipe Smls. & welded pipe | ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC |
| B | K22103 | ASTM A-203 | Plate | CryElso® 2.25 |
| WC4 | J12082 | ASTM A-217 | Casting | ASME BPVC |
| G9Ni10 LC2 | 1.5636 J22500 | EN 10213 ASTM A-352 | Casting Casting | EN 13445-2 & 13480-2 ASME BPVC |
| G20NiMoCr8-5-4 | 1.6570 | EN 10293 | Steel casting | – |
| G35CrNiMo6-6 | 1.6579 | EN 10293 | Steel casting | – |