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MAN-CRO®
MAN-CRO AR grades are quenched and tempered alloy steels designed to provide an excellent combination of high strength (100,000 psi minimum yield), toughness, abrasion resistance, and weldability in plate thicknesses through 3 inches. By desulphurizing and degassing during manufacture, we are able to offer a “clean” alloy while providing good cold forming characteristics and impact properties to temperatures as low as –40˚ C and still eliminate welding problems.

MAN-CRO® - AR grades are quenched and tempered alloy steels designed to provide an excellent combination of high strength, toughness and abrasion resistance. MAN-CRO® - AR Grade Alloy
MAN-CRO AR grades are quenched and tempered alloy steels designed to provide an
excellent combination of high strength (100,000 psi minimum yield), toughness, abrasion resistance, and weldability in plate thicknesses through 3 inches. By desulphurizing and degassing during manufacture, we are able to offer a “clean” alloy while providing good cold forming characteristics and impact properties to temperatures as low as –40˚ C and still eliminate welding problems.




St Lawrence Steel - Alloy Plate Products - MAN-CRO®

MAN-CRO® - Approved Welding Rod and Wire
Filler metal with lower tensile and yield strength are recommended in welding MAN-CRO 400F, 450F and 500F.  This type material provides more ductility while the weld is cooling, thus reducing stress on the joint.
AWS E70XX, E80XX and E90XX shielded metal-arc electrodes have been successful for submerged-arc and gas metal arc wire. Low hydrogen flux is also recommended.
For butt weld, when the joint strength must be equal to that of the parent plate, electrodes equivalent to AWS E 11018 are recommended.

MAN-CRO® - Recommended Material Processing
Cutting
MAN-CRO© steel plates can be thermally cut with oxygen-fuel and plasma-cutting techniques.  The minimum recommended plate temperature for all grades should be +60° F.    When thermally cutting or welding MAN-CRO© 400F and 450F greater than 2” in thickness and 500F greater than 1 inch in thickness the plates must be preheated to 300° F to prevent cracking.  We recommend the use of St. Lawrence Steel’s fabrication services to eliminate errors in the processing and fabrication with MAN-CRO© steel plates.

Forming
The low level of oxides and sulfides present in MAN-CRO grades provides superior bending properties. Bending force required is approximately 4X carbon steel grades. Plates should be rolled or bent with the grain (rolling direction) which is clearly marked on each plate. 3t is usually minimum radius for MAN-CRO 400F up to 3/4” thick plate, 6t for MAN-CRO 500F up to 1/2” thick plate.

If the bend is parallel to rolling direction of plate, radii should be increased. “Bumping” in a press brake is recommended procedure for forming heavier sections. Care should be exercised to insure that brake equipment has capacity to bend form hardened steels, usually 4x power required to form mild steel. Some representative values on actual cold bending are listed below.

Machining
High speed steels, cobalt or cemented carbide can be used for planing, cutting, drilling and countersinking. Reducing speeds depending on plate hardness are recommended. Use a top angle (included) of 150˚ and edge clearance of 5°-7°. 
Machining guidelines are:

Welding
Consumables: AWS E70XX, E80XX and E90XX shielded metal-arc electrodes usually acceptable as an all purpose rod to join MAN-CRO® to itself or most low alloy steels. An MAN-CRO® weldment will produce desired dilution with the electrode to enhance greater strength at joint.

For butt weld, when the joint strength must be equal to that of the parent plate, electrodes equivalent to AWS E 11018 are recommended.