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1.2085 Tool Steel — X33CrS16 Corrosion-Resistant Mold Steel
1.2085 mold steel for reliable machining and corrosion-conscious tooling. A pre-hardened, sufur-modifed chromium mold steel used for mold bases, holders, frames, dies, and tooling where easier machining and improved corrosion resistance are practical purchasing priorities.
Designed for the work around the cavity-not premium mirror polish
1.2085 is commonly specified for mold construction parts that benefit from a combination of corrosion resistance, pre-hardened delivery, and machinability. Sulfur helps chip formation and machining, while chromium supports resistance to humid shop conditions, cooling-water exposure, and some chemically aggressive plastics.
For high-gloss cosmetic cavities or demanding texturing, discuss alternative mold-steel grades with the steel supplier and toolmaker. Grade selection should follow the required surface finish, corosion environment, section size,and heat treatment plan.
Corrosion-conscious choice: High chromium content supports tooling used around humidity, cooling water, and aggressive plastic-processing environments.
Improved machinability: Sulfur modification helps machining performance for large mold bases, frames, holders, and complex plate work.
Ready-to-machine hardness: Typically supplied pre-hardened around 280-325 HB, reducing the need for a separate hardening cycle on many parts.
1.2085 composition, hardness, and processing guidance
Grade Identity
Chemical composition
Heat-treatment process
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Soft annealing: about 780-820℃, followed by slow furnace cooling. Reduce hardness before extensive machining when required.
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Hardening: producer guidance commonly lists about 1000-1050℃ with oil or air quenching. Additional hardening where the as-supplied condition is not the final target.
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​Tempering: Temper Immediately after hardening; choose temperature from the producer’s tempering curve. Balance final hardness, toughness, dimensional stability, and corrosion behavior.
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Stress relieving: Use a steelmaker-approved cycle after heavy rough machining or weld repair. Reduce residual stress before finishing critical dimensions.
Applications-Built around practical mold construction
1.2085 is most persuasive in the structural and supporting parts of a mold system: bases, plates, frames, holders, and tooling that sees humidity or aggressive processing conditions but does not require a premium optical finish.
Mold bases and support plates: large plates, frames, backing plates, and structural mold components that benefit from pre-hardened delivery and efficient machining.
Corrosion-sensitive tooling: components exposed to humid storage, condensation, cooling-water leakage, or plastics that can create a chemically aggressive processing environment.
Holders, dies, and fixtures: tooling parts where dimensional reliability, corrosion resistance, and practical machining outweigh premium surface-finish requirements.
Food and packaging support tooling: selected support parts and non-cosmetic tooling where corrosion-conscious steel selection is important; application approval remains project-specific.
Common questions about DIN 1.2085
1. What is 1.2085 steel?
1.2085 is a chromium-alloyed, sulfur-modified mold steel commonly supplied pre-hardened. It is selected when corrosion resistance, machinability, and dependable mold-base performance matter more than premium mirror polishability.
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2. Is 1.2085 the same as 420FM?
420FM is a common commercial reference used for sulfur-modified 420-type mold steel.Exact equivalence can vary by producer and specification, so purchase orders should state
1.2085/X33CrS16 and confirm chemistry, hardness, dimensions, and certification.
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3. What hardness is 1.2085 supplied at?
Many producer datasheets describe a quenched-and-tempered delivery condition around 280-325 HB, approximately 29-33 HRC. The exact value must be confirmed on the mill certificate for the ordered lot.
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4. Can 1.2085 be polished to a mirror finish?
It is generally not the first choice for high-polish or textured cosmetic mold surfaces. The sulfur addition improves machinability but reduces polishability compared with grades designed for premium surface finish.
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5. What is 1.2085 commonly used for?
Typical uses include mold bases, support plates, frames, holders, dies, fixtures, and tooling exposed to humid storage, cooling-water leakage, or aggressive plastics where corrosion
resistance and easy machining are valuable.
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6. What information is needed for a quotation?
Send the required form, dimensions, quantity, delivery condition or hardness, machining
allowance, testing or certificate requirements, destination, and target delivery date.