Influence of Different Heat Input on Submerged Arc Welded Joints of High Strength Low Alloy Steel SX780CF

Steels with 50 ksi and up yield points usually acquire their strength from some form of heat treatment. Most of these steels, 11/2 in. thick and up, must be welded using sustained preheat and controlled interpass temperatures, plus controlled welding heat input of approximately 50 to 60 kJ/in. These two items can add as much as 50 percent to the cost of submerged-arc welding, and increases of up to 30 percent are common for manual welding when compared with lower-strength steels previously used. To reduce costs, a quenched and precipitation-hardened steel, ASTM A710 Grade A Class 3, with a high degree of weldability, was tested. This steel, which can be welded without sustained preheat and almost unlimited heat input, has been extensively tested in thicknesses from 21/4 through 6 in. Although this steel costs more than the usual quenched-and-tempered plates at these strength levels, reductions of 40 to 75 percent in welding labor costs are probable. In addition, sizeable material savings should be realized when these items are used in place of HY-80 and HY-100.

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Analysis of niobium-rich phases in the submerged arc welds of high strength low alloy steel

Materialia ◽

10.1016/j.mtla.2019.100340 ◽

2019 ◽

Vol 7 ◽

pp. 100340 ◽

Cited By ~ 1

Author(s):

Xun Liu ◽

Mingjie Xu ◽

Qianying Shi ◽

Jiarui Kang ◽

John Procario ◽

...

Keyword(s):

Alloy Steel ◽

High Strength ◽

Low Alloy Steel ◽

Submerged Arc

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Impact Toughness of High-Strength Low-Alloy Steel Welded Joints

Applied Engineering Letters Journal of Engineering and Applied Sciences ◽

10.18485/aeletters.2018.3.3.3 ◽

2018 ◽

Vol 3 (3) ◽

pp. 98-104 ◽

Cited By ~ 3

Author(s):

Andreja Ilić ◽

Lozica Ivanović ◽

Blaža Stojanović ◽

Danica Josifović ◽

Eleonora Desnica

Keyword(s):

Impact Toughness ◽

Alloy Steel ◽

Welded Joints ◽

High Strength ◽

Low Alloy Steel

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Corrosion behavior of the high strength low alloy steel joined by vertical electro-gas welding and submerged arc welding methods

Journal of Manufacturing Processes ◽

10.1016/j.jmapro.2016.12.011 ◽

2017 ◽

Vol 25 ◽

pp. 418-425 ◽

Cited By ~ 8

Author(s):

Weiming Liu ◽

Hongbo Pan ◽

Liaosha Li ◽

Huihong Lv ◽

Zhaojin Wu ◽

...

Keyword(s):

Alloy Steel ◽

Corrosion Behavior ◽

Arc Welding ◽

High Strength ◽

Submerged Arc Welding ◽

Low Alloy Steel ◽

Submerged Arc

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Thermal Simulation Study of 900MPa Grade High-Strength Low Alloy Steel in Welding Procedures

Materials Science Forum ◽

10.4028/www.scientific.net/msf.704-705.1128 ◽

2011 ◽

Vol 704-705 ◽

pp. 1128-1132

Author(s):

Di Xin Yang ◽

Yuan Fang Sun

Keyword(s):

Alloy Steel ◽

Heat Input ◽

High Strength ◽

Weld Bead ◽

Peak Temperature ◽

Welding Parameters ◽

Chemical Compositions ◽

Low Alloy Steel ◽

Hydraulic Support ◽

Welding Heat Input

Hydraulic support is an important part of fully mechanized equipments. The constructional steels of hydraulic support with international advanced level mainly adopt the high-strength welding structural steel with its tensile strength of more than 700~1000MPa.This paper analyzes the chemical compositions features of S890 high-strength low alloy steel for 900MPa grade.The Influence of welding parameters,peak temperature and on the microstructures and mechanical properties of welding HAZ of S890 high-strength low alloy steel were investigated by thermo-simulated tests, The influence of welding heat input on the mechanical behaviors of the welded joint was also investigated. The results show that the microstructures of S890 steel change from tempered martensite to bainite and a little ferrite , pearlitic when welding heat input changes from low to high, and accompany the austenite grains coarsening ,so the impact toughness and hardness of welding HAZ at lower peak temperatures and shorter are higher than that at higher peak temperature and long . Welding HAZ produced by the second weld bead will overlap partially with the HAZ produced by the first weld bead. In this area, primitive microstructure tempers again or partial re-phase transformations and re-cools,but the area involved in the overlap is limited,so the influence on the properties of S890 steel is not obvious. In covered arc welding,the influence on the welded join strength of S890 steel is not distinct when heat input change in a certain scope, but the plasticity of the welded join falls off steeply as heat input increases. Keywords: S890 steel; high-strength low alloy steel; weld performance; hydraulic supports

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