1.2085 | DIN 1.2085 X33CrS16 | Corrosion-Resistant Plastic Mold Steel Supplier

1.2085 (X33CrS16) is a premium martensitic stainless tool steel specifically developed for plastic mold applications requiring corrosion resistance. What sets this grade apart is its dual-purpose nature: high chromium content (15.00-17.00%) provides excellent protection against aggressive plastics like PVC, while controlled sulfur addition significantly enhances machinability without compromising mechanical properties.

This versatile grade is also designated as 3Cr17+S in China, SUS420F in Japan, and similar to 420FM in the USA. Whether for injection mold frames, corrosion-resistant mold bases, PVC processing tools, or support plates exposed to moisture, it delivers superior performance in challenging environments. Supplied pre-hardened (280-325 HB) for immediate use or annealed for custom heat treatment.

Material Shape and Size of 1.2085

1.Round Bar

Flat Bar

1.2085 Alternative

Standard System	Country/Region	Equivalent Grade	Common Search Terms
DIN EN	Germany	1.2085, X33CrS16	1.2085 steel, DIN 1.2085, X33CrS16
AISI/ASTM	USA	420FM (similar)	420FM stainless steel
JIS	Japan	SUS420F	SUS420F steel, JIS SUS420F
GB	China	3Cr17+S, 3Cr17NiMo+S	3Cr17+S steel, Chinese standard 1.2085
ISO	International	X33CrS16	ISO 1.2085 equivalent

Chemical Composition of 1.2085 Material

Element	C	Si	Mn	P	S	Cr	Ni
Content (%)	0.28-0.38	≤1.00	≤1.40	≤0.030	0.05-0.10	15.00-17.00	≤1.00

Note: The defining feature of 1.2085 mateial is its high chromium content (15-17%), which provides excellent corrosion resistance against aggressive plastics and humid environments . The controlled sulfur addition (0.05-0.10%) significantly improves machinability, while nickel and molybdenum enhance toughness and hardenability .

1.2085 Mechanical Property

MECHANICAL PROPERTY	METRIC VALUE	IMPERIAL VALUE
Hardness (Annealed)	≤230 HB	≤230 HB
Hardness (Pre-hardened / Quenched & Tempered)	280 – 325 HB	280 – 325 HB
Hardness (Hardened)	51 – 55 HRC	51 – 55 HRC

Delivery Condition of Material 1.2085

Black Surface, Bright Surface, Turned Surface, Grinded Surface, Poblished surface.

1.2085 Application

Plastic Mold Industry: Injection mold frames and bases, cavity plates for corrosive plastics (PVC, POM, ABS), support plates exposed to wet machining or storage
Corrosive Material Processing: Molds for processing PVC and other halogenated plastics, components handling acidic thermoplastics, equipment for the food industry
Mold Bases and Die Sets: Corrosion-resistant mold bases for injection molding machines, die sets requiring protection against cooling water and humidity
Automotive Industry: Mold components for automotive interior parts, support plates in humid manufacturing environments
Mechanical Engineering: Machine parts operating in wet conditions, components requiring corrosion resistance with good machinability
Hot Runner Systems: Components for hot runner molds, manifold plates requiring corrosion protection
Medical Device Manufacturing: Molds for medical components where corrosion resistance is essential, surgical instrument tooling
Measuring and Gauging Tools: Precision gauges and measuring tools operating in humid environments

Heat Treatment & Processing of 1.2085 Steel

1.2085 Heat Treatment:

Soft Annealing: Heat to 850-880°C, hold 2-5 hours, slow furnace cool. Resulting hardness ≤240 HB, optimized for extensive machining operations
Stress Relieving: Heat to 600-650°C, hold 1-2 hours, slow cool. Relieves machining stresses when modifications are required
Preheating: Heat slowly to 600-800°C before hardening to minimize thermal shock
Hardening (Austenitizing): Temperature 1000-1050°C, hold 30 minutes at temperature, quench in oil (preferred) or polymer bath . Achievable hardness after quenching: 51-55 HRC
Tempering: Double tempering recommended for optimal properties. Temper immediately after quenching at 150-500°C depending on target hardness. Hold minimum 2 hours per 20mm section

Processing Guide:

Forging: Hot forming temperature 1050-850°C, slow cool after forging
Nitriding: Possible for surface hardening, though pre-hardened condition typically sufficient for most applications
EDM (Electrical Discharge Machining): Suitable for wire EDM; remove white layer after machining

1.2085 Quality Inspection & Control

Full-process control: Raw material inspection (certificate, composition); production inspection (composition, mechanical properties, 100% UT, dimensional, surface); finished product inspection (MTC EN 10204 3.1, reports).

Our Advantages of 1.2085

Strong Production Capacity: 10,000 tons/year, advanced equipment.
Adequate Stock: 600+ tons standard specs (3-7 days delivery); custom specs 15-30 days.
Custom Processing: One-stop sawing, milling, drilling, polishing, heat treatment.
Strict Quality Control: Full-process inspection, professional team/equipment.
Global Supply: Container/LCL shipment, anti-rust packaging, on-time delivery.
Professional Technical Support: Senior engineers guide material selection, heat treatment, processing.