DAIKOWS 5CrMo

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  • CREEP RESISTING STEELS
5CrMo

Description

5%Cr-1%Mo solid wire for elevate temperature service
Submerged arc wire designed for 5% Cr 0.5% Mo alloyed steels and steels for pressurized hydrogen service, particularly in oil refineries prolonged elevated temperature service up to about 650°C, especially in oil refineries (piping, heat exchangers, pressure vessels, boiler superheaters).
Specifications
ISO 24598-A
S CrMo5 FB
AWS A5.23
EB6
Shielding
DAIKOFLUX 982
Positions
PA, PB, PC
Current
DC/AC
Packaging Type
K415 spool and drums.
Asme qualifications
F-No (QW432)
6
A-No (QW442)
5
Chem. Comp. %
DEFAULT
C
0.07
Mn
0.5
Cr
5.5
P
0.01
S
0.01
Mo
0.55
Si
0.4
Cu
0.15
Mechanical Properties
min
variant
Tensile strength Rm MPa
590
630
Yield strength Rp0.2 MPa
400
520
Elongation A (L0=5d0) %
17
20
Impact Charpy ISO-V
47J @ 20°C
80J @ 20°C
Impact Charpy ISO-V
-
-
Welding Parameters
2.4 mm
3.2 mm
4 mm
Ampere
350A - 450A
430A - 530A
480A - 580A
Voltage
27V - 31V
27V - 31V
27V - 31V
Packaging
Ø 2,0÷4,0mm
Ø 2,0÷4,0mm
Ø 2,0÷4,0mm
Packaging Type
K415 spool and drums.
K415 spool and drums.
K415 spool and drums.
Description

Application

Designed for elevated temperature service up to 600°C, this weld metal demonstrates exceptional corrosion resistance in challenging environments such as superheated steam, hot hydrogen gas, and high-Sulphur crude oils. Its primary applications span across critical components in oil refineries, notably serving in boiler superheaters, heat exchangers, piping, and pressure vessels. Beyond its conventional uses, this weld metal has proven successful in unique applications, including subsequent nitriding. For instance, it has been effectively employed in the repair of 3Cr-1Mo-V and 2Cr-Mo-1A1 steels, commonly used for molds in the injection molding of plastics. This versatility highlights its capability to address specialized requirements, showcasing its adaptability across diverse industrial scenarios.

Alloy Type

5%Cr-½%Mo steel for elevated temperature service up to 600°C.

Microstructure

In the PWHT condition the microstructure consists of tempered bainite.

Materials


EN W.Nr.: 12CrMo 19 5 (1.7362), X7CrMo 6 1 (1.7373), X11CrMo 6 1 (1.7374), GS-12CrMo 19 5 (1.7363).
ASTM: A387 gr. 5, A335 gr. P5, P5b, A234 gr. WP5 (fittings), A199 gr. T5, A213 gr. T5, T5b, A182 gr. F5, F5a, A336 gr. F5, A217 gr. C5.

Welding & PWHT

Due to the inherent hardness observed in the as-deposited state, reaching values of up to 400HV, coupled with the relatively diminished fracture resistance characteristic of the 5CrMo bainitic microstructure, it is recommended to employ a preheat and maintain a minimum interpass temperature of 200°C. This measure is essential to prevent the occurrence of hydrogen-induced cold cracking. Ensuring electrodes are meticulously controlled and handled is crucial to achieve weld metal with hydrogen levels below 5ml/100g. In instances involving TIG root runs or all-TIG welds, consideration may be given to a lower preheat of 150°C. However, it should be acknowledged that opting for faster cooling rates in such scenarios may result in deposits that are partially martensitic and harder in nature. The complete transformation of the 5CrMo during welding occurs within a working range of 200-350°C. Consequently, direct transfer (at temperatures exceeding 150°C) to Post-Weld Heat Treatment (PWHT) is permissible, followed by Non-Destructive Examination (NDE). If PWHT is intended after complete cool-out and NDE, it is advisable to maintain the preheat temperature for a specified duration post-welding, in accordance with thickness, to facilitate effective hydrogen dispersal. Notably, this precaution holds less significance for TIG and solid wire MAG processes. PWHT to temper the weldment typically falls within the range of 705-760°C, aligning with ASME B31.3 standards. The minimum recommended holding time for this process is two hours. For castings, the suggested minimum PWHT temperature is lower, with specified temperatures as low as 670°C.

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