DAIKOWT 2CrMoS

GTAW
  • CREEP RESISTING STEELS
2Cr1Mo

Description

Rod for 2¼% Cr-1% Mo steel resistant to creep
Rod characterized by a high content of silicon and manganese, designed to enhance weldability and weld metal quality. Developed for prolonged service at high temperatures up to about 600 °C, it is suitable for steam power plants (pipelines, valve bodies, turbine castings, boiler superheaters). It ensures corrosion resistance from sulfur-containing crude oil (250–450 °C) and excellent performance against hydrogen attack in chemical and petrochemical plants, such as hydrocrackers, coal liquefaction plants, and pressure vessels for ammonia (NH₃) up to 450 °C.
Specifications
EN ISO 21952-A
W CrMo 2 Si
AWS A5.28
ER90S-G
Shielding
I1
Positions
PA, PB, PC, PD, PE, PF
Current
DC-
Packaging Type
5kg carton tube
Asme qualifications
F-No (QW432)
6
A-No (QW442)
4
Chem. Comp. %
DEFAULT
C
0.07
Mn
1
Ni
0.08
Cr
2.5
P
0.01
S
0.01
Mo
0.9
Si
0.7
Cu
0.15
Mechanical Properties
min
variant
Tensile strength Rm MPa
620
640
Yield strength Rp0.2 MPa
400
540
Elongation A (L0=5d0) %
15
21
Impact Charpy ISO-V
47J @ 20°C
150J @ 20°C
Impact Charpy ISO-V
-
-
Welding Parameters
1.6 mm
2.4 mm
Ampere
95A - 135A
145A - 205A
Voltage
-
-
Packaging
Ø 1,2÷3,2mm
Ø 1,2÷3,2mm
Packaging Type
5kg carton tube
5kg carton tube
Description

Application

The 2Cr1Mo consumables are designed to ensure durability and performance at high temperatures, up to 600 °C. These materials are widely used in steam power plants, essential for the construction of pipework, turbine casings, steam chambers, valve bodies, and boiler superheaters. Additionally, they are used in refineries for their resistance to corrosion caused by sulfur-containing crude oil, effectively operating at temperatures between 250 and 450 °C. In the chemical and petrochemical industry, these materials are crucial for resisting hydrogen attack. They are employed in the manufacture of hydrocrackers, coal liquefaction plants, and NH₃ pressure vessels operating up to 450 °C. Under welding conditions, the materials offer deposits with a hardness of 300 HV, ideal for build-up or hardfacing, metal-to-metal wear resistance, heavy impact, and repairs of P20 tool steel. A minimum preheat and interpass temperature of 250 °C is recommended, increased up to 300 °C for sections of considerable thickness, maintaining the temperature throughout the welding cycle and subsequently. Unless otherwise specified, it is imperative to perform post-weld heat treatment (PWHT), generally carried out at 690 °C, with duration varying based on the section thickness.

Alloy Type

2¼Cr-1Mo alloyed steel consumables for elevated temperature service.

Microstructure

After PWHT, the microstructure consists of tempered bainite.

Materials

  • EN W.Nr.: 11 CrMo 9-10 (1.7383), 10 CrMo 9-10 (1.7380), GS-18CrMo 9 10 (1.7379), GS-12CrMo 9 10 (1.7380), 6CrMo 9 10 (1.7385), 12CrMo 9 10 (1.7375)
  • ASTM: A387 Gr 21&22, A182 F22, A217 WC9, A234 WP22, A199 T21,T22, A200 T21,T22, A335 P22, A234 WP22

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