PLATE - DURACORR® - PROCESSING INFORMATION
Welding
Duracorr®, a registered trademark of Mittal Steel, is weldable with most standard electric arc and resistance welding techniques, providing appropriate procedures are followed. Duracorr®, a registered trademark of Mittal Steel, can be welded to itself and to stainless and carbon steels. It does not develop the higher hardness associated with martensitic stainless steels, nor the coarse-grain, low-toughness properties found in ferritic stainless steels. The dual phase microstructure of austenite plus ferrite in the heat-affected zone during welding limits grain growth in the HAZ, enhancing toughness in weld areas. Due to the variety of steels and welding processes used, the following general guidelines are recommended for welding Duracorr®, a registered trademark of Mittal Steel.
» Welding qualification procedures should be established for each welding process using AWS D1.1. Contact Tricon® if assistance is required.
» Electrodes of the AWS 309L, 308L, 316L types or equivalent should be used with the current settings at the low to middle range recommended by the electrode manufacturer. Use of AWS 309L is preferred when welding Duracorr® to other steels.
» The heat input during welding should be minimized to produce a weldment (weld and heat affected zone) with optimum properties.
» The SMAW, GMAW, GTAW and FCAW processes have been routinely used. Because of the high heat input inherent in SAW, it is rarely used. When SAW is used, care must be taken to minimize dilution of the weld metal.
» A plate temperature of +60°F is recommended for Duracorr®, a registered trademark of Mittal Steel. If the steel being welded to Duracorr®, a registered trademark of Mittal Steel, requires additional preheat, the requirements for that steel should be followed.
» Parts to be welded should be free of loose or thick scale, moisture, grease or other foreign materials that could influence weld quality.
Duracorr® Processing
Duracorr®, a registered trademark of Mittal Steel, exhibits a fine-grained microstructure of ferrite and tempered martensite that imparts attractive fabrication characteristics. Duracorr®, a registered trademark of Mittal Steel, is formable and weldable when the guidelines below are followed.
Cold Forming
Due to its higher yield strength levels, Duracorr®, a registered trademark of Mittal Steel, requires higher forming loads than mild steel-such as ASTM A36-during bending and other cold forming operations. It also exhibits slightly more spring-back.
» When bending Duracorr®, a registered trademark of Mittal Steel, with sawed, plasma-cut or ground edges, a 1/2t (t = thickness) minimum bend radius should be observed.
» If the edges are sheared, the 1/2t radius only applies to bends perpendicular to the major rolling direction. Bends parallel to the major rolling direction should use a 2t minimum bend radius. The 1/2t guideline may be used for all orientations if the complete cold worked sheared edge (face and burr) in the location of the bend is ground removing approximately 0.05".