
Stainless Steel 431 scrap clean technical specifications and commercial data without element chemical symbols for pressed scrap and loose scrap:
Material Identification
Material Grade: Stainless Steel 431 / UNS S43100 / 1.4057
Alloy Class: High-Chromium, High-Nickel Martensitic Stainless Steel
Magnetic Nature: Strongly Magnetic (in all conditions)
Scrap Type: Clean Pressed Bundles / Clean Loose Scrap (free of oil, heavy rust, scale, slag, paint, and foreign attachments)
Chemical Composition Limits (Percent by Weight)
Chromium: 15.00 to 17.00
Nickel: 1.25 to 2.50
Carbon: 0.20 Maximum
Manganese: 1.00 Maximum
Silicon: 1.00 Maximum
Phosphorus: 0.040 Maximum
Sulfur: 0.030 Maximum
Iron: Balance
Physical Forms and Categories
Pressed Scrap (Baled Grade):
Hydraulically compressed bales, cubes, or bundles composed of sheet offcuts, trim skeletons, and thin stampings
High-density bundles prepared for rapid furnace charging and minimal melt-loss
Loose Scrap (Heavy Melt Grade):
Solid round, square, and hexagonal bar offcuts
Heavy plate cuttings, forging flash, and ingot ends
Shaft offcuts, marine hardware scrap, and heavy valve body drop-offs
Heavy-wall tube crop ends and thick structural shearings
Physical and Thermal Properties
Density: 7.75 grams per cubic centimeter
Melting Point Range: 1420 to 1470 degrees Celsius
Maximum Continuous Service Temperature: Up to 700 degrees Celsius in air
Quality and Contamination Thresholds
Pressed Scrap (Baled):
Bundle Density: High compaction (minimum 75 to 100 pounds per cubic foot / 1.2 to 1.6 grams per cubic centimeter)
Non-Metallic / Dirt Contamination: Less than 1.0 percent internal trapped debris
Moisture & Oil: Dry / Zero free liquids or heavy greases trapped inside bales
Loose Scrap:
Thickness: 3.0 millimeters (1/8 inch) and heavier preferred for heavy melt additions
Non-Metallic Contamination: Less than 0.5 percent
Oil and Grease Attachment: Nil / Cleaned surface
Foreign Alloy Mixing: Zero allowable high-nickel austenitic grades, carbon steel, free-machining sulfurous grades, or non-ferrous contaminants
Primary Industrial Applications for Remelting
High-tensile pump and propeller shafts
Aircraft fittings, structural fasteners, and bolt stock
Valve components, stems, and hydraulic equipment
Industrial equipment operating in marine and mildly corrosive environments
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