430 Stainless Steel Strip (Full Hard/Half Hard)

Updated: 2026-07-31

Overview

430 stainless steel strip is a chromium-containing ferritic stainless steel commonly supplied in fully hard (hardness ~85 HRB) or half hard (~75 HRB) tempers. The '430' designation refers to its standard AISI/SUS composition, which balances corrosion resistance with affordability. Unlike austenitic grades like 304, 430 stainless is magnetic and has lower nickel content, making it a cost-effective choice for applications where extreme corrosion resistance isn't required. The fully hard and half hard tempers provide different balances of strength and formability for industrial users.

Structure and Working Principle

430 stainless steel's properties derive from its ferritic microstructure, stabilized by 16-18% chromium content. In strip form, the material is cold-rolled to achieve desired thickness (commonly 0.1-3.0mm) and then temper-rolled to produce fully hard or half hard characteristics. The fully hard temper undergoes maximum cold working, yielding higher tensile strength (≥515 MPa) but reduced elongation (≤10%). Half hard temper offers moderate strength (450-550 MPa) with better formability (12-20% elongation). Neither temper requires heat treatment after forming unless severe deformation is needed.

Key Features

430 stainless strips exhibit good resistance to nitric acid, organic acids, and atmospheric corrosion, though they underperform 304 grades in chloride environments. Their magnetic permeability makes them suitable for electromagnetic applications. The fully hard temper provides maximum stiffness for applications like blade springs or stiffening components, while half hard offers better formability for bending or shallow drawing. Both tempers maintain the alloy's signature bright metallic finish when properly polished, making them popular for decorative trims.

Application Areas

In appliances, 430 strips are used for refrigerator panels, dishwasher interiors, and oven trim due to their heat resistance and cleanability. Automotive applications include trim moldings, wheel covers, and exhaust components (non-structural). Industrial uses encompass conveyor components, chemical processing equipment (for non-chloride media), and architectural cladding. The half hard temper is preferred for formed parts like sink rims or cabinet handles, while full hard suits flat components requiring rigidity like electrical enclosures or machine guards.

Maintenance and Precautions

While 430 resists staining better than carbon steel, periodic cleaning with mild detergent maintains appearance. Avoid abrasive cleaners that could damage the passive chromium oxide layer. For fabrication, anneal fully hard strips (815-870°C) before severe forming operations. Use proper tooling clearances to prevent galling. In service, limit exposure to marine environments or chlorinated cleaners to prevent pitting corrosion. Spot welding requires different parameters than austenitic grades due to higher electrical resistance.

B2B Procurement Guide

When sourcing 430 strips, specify: temper (full/half hard), thickness tolerance (typically ±0.02mm for precision strips), width (slit edge or mill edge), surface finish (e.g., No. 2B matte or BA bright annealed), and packaging (coil weight, protective wrapping). Verify mill certifications for composition (especially chromium content) and mechanical properties. For decorative applications, request samples to check surface consistency. Lead times vary by quantity – standard tempers often have stock availability, while custom widths/surfaces may require 4-6 weeks production. Consider local service centers for just-in-time deliveries to minimize inventory costs.