G-TECH 1CrMo

SMAW
  • CREEP RESISTING STEELS
1CrMo

Description

Basic coated electrode for creep resisting steels and cast steels up to 530°C
Designed for prolonged elevated temperature service up to about 530°C, especially in steam generation power plants (piping, valve bodies, turbine casting, boiler superheaters…). Suitable for corrosion resistance to sulphur bearing crude oil at 250-450° C. Used in chemical and petrochemical industries for resistance to hydrogen attack in fabrication of hydrocrackers, coal liquefaction plant and NH3 pressure vessel operating at up to 450° C. These electrodes have good weldability in all positions. Low spatter loss, good bead appearance. Ready striking and deslagging.
Specifications
ISO 3580-A
E Cr Mo 1 B 32
AWS A5.5
E8018-B2
Shielding
-
Positions
PA, PB, PC, PD, PE, PF
Current
DC+, AC
Packaging Type
Carton box
Asme qualifications
F-No (QW432)
4
A-No (QW442)
3
Chem. Comp. %
DEFAULT
C
0.08
Mn
0.8
Ni
0.05
Cr
1.25
P
0.015
S
0.01
Mo
0.6
Si
0.6
Cu
0.05
Mechanical Properties
min
variant
Tensile strength Rm MPa
550
680
Yield strength Rp0.2 MPa
460
580
Elongation A (L0=5d0) %
19
22
Impact Charpy ISO-V
-
100J @ 20°C
Impact Charpy ISO-V
-
-
Welding Parameters
2.5 mm
3.2 mm
4 mm
5 mm
Ampere
65A - 90A
90A - 130A
140A - 180A
190A - 230A
Voltage
-
-
-
-
Packaging
45 pcs/kg
21 pcs/kg
14 pcs/kg
10 pcs/kg
Packaging Type
Carton box
Carton box
Carton box
Carton box
Description

Application

Designed for prolonged elevated temperature service up to 550°C, these consumables have primary applications in steam-generating power plants. These consumables excel in various components like piping, turbine castings, steam chests, valve bodies, and boiler superheaters. They also provide corrosion resistance in refineries for sulfur-bearing crude oil (250-450°C) and resist hydrogen attack in chemical and petrochemical industries for hydrocrackers, coal liquefaction plants, and NH3 pressure vessels (up to 450°C). In the as-welded state, these consumables yield a weld deposit with a useful 300HV hardness, suitable for build-up or hard surfacing to combat metal-to-metal wear and heavy impact. A minimum preheat and interpass temperature of 200°C is recommended, extending up to 300°C for thicker sections. It is crucial to maintain these temperatures throughout the welding cycle and for some time after the completion of welding. With the exception of specific applications, post-weld heat treatment (PWHT) is invariably necessary, typically at a temperature of 690°C, the duration of which depends on the thickness of the section.

Alloy Type

1¼Cr-½Mo alloyed steel consumables for elevated temperature service.

Microstructure

After PWHT, the microstructure consists of tempered bainite.

Materials


EN W.Nr.: 13CrMo 4-5 (1.7355), 13CrMo 4-4 (1.7335), 16CrMo 4-4 (1.7337), 11CrMo 5-5 (1.7339), GS-25CrMo 4 (1.7128), GS-17CrMo 5-5 (1.7357).
ASTM: A387 Gr 11 & 12, A182 F11 & F12, A217 WC6 & WC11, A234 WP11 & WP12, A199 T11, A200 T11, A213 T11 & T12, A335 P11 & P12.

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