Low alloyed welding wires

69 4 Mn3Ni1CrMo ML-FK1 is a low-alloy, solid MIG/GMAW welding wire on a Mn3Ni1CrMo basis designed for high-strength fine-grain structural steels up to 690 MPa yield strength (e.g. S500Q–S690Q, Strenx 700, Dillimax 690, A514, HY80/HY100). Its alloy concept with Mn, Ni, Cr, Mo and V provides high tensile strength, good elongation and excellent low-temperature toughness, making it suitable for highly stressed welded structures. Typical applications include mobile cranes, concrete pumps, pressure vessels, offshore and pipeline components, tankers and heavy steel construction. The wire is classified according to EN ISO 16834-A as G 69 4 M21 Mn3Ni1CrMo and AWS A5.28 ER100S-G / ER110S-G, and is welded with DC electrode positive (MIG +). It is supplied in diameters from 0.8 to 1.2 mm on B-300 spools and in drums; required preheat, interpass and any post-weld heat treatment depend on base material grade, thickness and relevant design codes.

1.5424 2Mo ML-Mo is a low-alloy solid welding wire/rod with approx. 0.5 % Mo, designed for similar alloyed creep-resistant and high-temperature steels used up to about 500 °C and for certain sub-zero applications. With a typical composition of 0.10 % C, 0.60 % Si, 1.15 % Mn and 0.52 % Mo, it offers a balanced combination of strength and toughness (Re ≥ 460 MPa, Rm ≥ 560 MPa, A ≥ 22 %, impact energy ≥ 60 J at RT and ≥ 47 J at −40 °C). The filler metal is classified for MIG/GMAW as DIN EN ISO 14341-A G 42 2 C1 2Mo / G 46 6 M21 2Mo and EN ISO 21952-A G MoSi, and for TIG/GTAW as EN ISO 636-A W 46 4 2Mo / EN ISO 21952-A W MoSi, corresponding to material no. 1.5424 and AWS A5.28 ER70S-A1 / ER80S-G. It is intended for pressure vessels, boilers, piping and general structural components made from steels such as 16Mo3, P235G1TH–P255G1TH, P310GH, L320 and L360NB–L415NB, where improved creep performance and resistance to caustic cracking are required. Welding is typically carried out with DC electrode positive for MIG and DC electrode negative for TIG; preheat and interpass temperatures as well as any PWHT (as-welded or approx. 650 °C) are selected according to base material thickness and code requirements. The product is available as MIG wires in diameters 0.8–1.2 mm on spools and drums, and as TIG rods in diameters 2.0–3.0 mm in 1,000 mm lengths.

1.7339 CrMo1Si ML-CrMo1 is a low-alloy solid MIG/TIG filler metal for matching 1.25%Cr–0.5%Mo creep-resisting ferritic steels such as P11/P12 and related grades used up to about 550 °C. With a typical analysis of 0.10% C, 0.60% Si, 1.00% Mn, 1.20% Cr and 0.52% Mo, it delivers high yield and tensile strength, good elongation and excellent impact toughness down to −40 °C. The wire/rod is classified as EN ISO 21952-A G CrMo1Si / W CrMo1Si, material no. 1.7339, AWS A5.28 ER80S-G, and is designed for critical components in power generation (steam piping, turbines, boilers) as well as chemical and petrochemical plant. Low levels of tramp elements result in a very low Bruscato factor, supporting resistance to temper embrittlement in long-term high-temperature service. Recommended practice is preheat around 200 °C, interpass temperatures up to approx. 300 °C and post-weld heat treatment at about 620–690 °C; the product is welded with DC electrode positive for MIG and DC electrode negative for TIG and supplied as MIG wires (0.8–1.2 mm on B-300 spools/ECO-drums) and TIG rods (2.0–2.4 mm, 1000 mm length).

1.7384 CrMo2Si ML-CrMo2 is a low-alloy solid MIG/TIG filler metal for 2.25–2.5 %Cr–1 %Mo creep-resisting ferritic steels such as 10CrMo9-10 and the P21/P22 family, used in high-temperature service up to around 600 °C. Its typical composition (0.08 % C, 0.60 % Si, 0.92 % Mn, 2.45 % Cr, 1.00 % Mo) provides a balanced combination of strength and toughness, with yield strength ≥ 400 MPa, tensile strength ≥ 520 MPa, elongation ≥ 20 % and impact energy ≥ 80 J at room temperature. The wire features low levels of tramp elements, resulting in a low Bruscato factor and improved resistance to temper embrittlement in long-term high-temperature operation. Typical applications include steam piping, boilers and turbine components in power generation, as well as piping and pressure equipment in the chemical and petrochemical industries. Recommended procedures are preheating to about 200 °C, limiting interpass temperature to 300 °C and post-weld heat treatment around 690 °C, with DC electrode positive for MIG and DC electrode negative for TIG. ML-CrMo2 is supplied as MIG wires in 0.8–1.2 mm and TIG rods in 2.0–2.4 mm with standard spool, drum and 5 kg rod-tube packaging for industrial use.

1.5125 3Si1 ML-WSG2 is a solid TIG/GTAW rod on a C-Mn-Si basis (mat. no. 1.5125, EN ISO 636-A W 46 5 3Si1, AWS A5.18 ER70S-6) for welding unalloyed and low-alloy structural and fine-grain steels up to 420 MPa yield strength. With a typical composition of 0.09 % C, 0.87 % Si and 1.47 % Mn, the filler metal provides high strength (Re ≥ 460 MPa, Rm ≥ 560 MPa), good elongation and excellent impact toughness (≥ 100 J at room temperature, ≥ 47 J at −50 °C). It is used for standard C-Mn construction steels in shipbuilding, pressure vessel fabrication and general steel construction, covering common EN, ASTM and API grades such as S235–S420, P275–P355, A36, A106 and API 5L X42–X60. The rods are welded with DC electrode negative (TIG −) and are supplied as 1,000 mm TIG rods in diameters 2.0 and 2.4 mm, packed in 5 kg tubes, with TÜV, DB and CE approvals supporting use in safety-relevant applications.

1.5130 4Si1 ML-WSG3 is a low-alloyed TIG/GTAW rod on a CMn basis (material no. 1.5130, ISO 636-A W 50 5 4Si1, AWS A5.18 ER70S-6) designed for welding unalloyed and low-alloy structural and fine-grain steels up to 460 MPa yield strength. With a typical composition of 0.09 % C, 0.95 % Si and 1.67 % Mn, the filler metal combines high strength (Re ≥ 500 MPa, Rm ≥ 560 MPa), good elongation (≥ 18 %) and excellent impact toughness (≥ 100 J at room temperature, ≥ 80 J at −50 °C). It is suitable for a wide range of construction, pressure vessel and pipe steels according to EN, ASTM and API specifications (e.g. S235–S460, A36, A106, API 5L X42–X60) and is typically used in shipbuilding, pressure vessel fabrication and general construction. Preheating and post-weld heat treatment are generally not required, but depend on base material grade, thickness and applicable design codes. The rods are used with DC electrode negative (TIG −) and supplied as 1,000 mm TIG rods in 5 kg tubes in diameters from 1.0 to 3.0 mm.