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1.2316 Stainless Tool Steel: Anti-Rust Tool Steel

Traditionally, tool steel and stainless steel serve separate goals. Tool steel focuses on hardness and wear resistance, while stainless steel targets corrosion resistance. However, these two features are both necessary when making molds for chlorine-containing plastic, food-grade products or long-term use in humid environments. 1.2316 Stainless Tool Steel (DIN 1.2316 / 3Cr17NiMo) is developed to meet this dual demand. This article explains its dual material features and unique advantages in mold production from an industry perspective.

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1.2316 Stainless Tool Steel
1.2316 Stainless Tool Steel
DIN 1.2316
DIN 1.2316
1.2316 steel turned bar
1.2316 steel turned bar
1.2316 steel milled surface
1.2316 steel milled surface
1.2316 milling service
1.2316 milling service
1.2316 material milled surface
1.2316 material milled surface

The Dual Properties of 1.2316 Stainless Tool Steel: One Grade with Two Core Features

In steel classification systems, 1.2316 Stainless Tool Steel is a cross-category material. As mold steel, it falls into plastic mold steel DIN 1.2316 series. As stainless steel, it counts as heat-treatable martensitic stainless steel. As tool steel, it owns standard tool steel hardness (28-34 HRC pre-hardened) and good machinability. The mix of these three traits creates its unique position: it has the protective Cr₂O₃ passive film of stainless steel, the hardness and wear resistance of tool steel, plus easy machining performance. This design is not a compromise but precise engineering, made for mold projects that face three combined demands: corrosion risks, hardness requirements and machining limits.

Tool Steel Features of 1.2316 Stainless Tool Steel

The core value of tool steel lies in its usability for tool making, which includes enough hardness, wear resistance and anti-deformation performance. 1.2316 steel reaches 28-34 HRC under pre-hardened state and can hit 40-48 HRC after quenching, a hardness range that supports long-term service for injection molds. Compare it with other tool steels: D2 (Cr12Mo1V1) hits 60-64 HRC after quenching with much higher hardness yet poor corrosion resistance; H13 reaches 50-55 HRC and works well under high temperature but also cannot resist rust; P20 (1.2311) is pre-hardened to 28-32 HRC with similar hardness to 1.2316 but has zero stainless performance. DIN 1.2316 tool steel stands out as one of the rare tool steels that deliver stainless anti-corrosion performance at 28-34 HRC pre-hardened grade, and such balanced performance is hard to find in the steel market.
 
Tool Steel GradeHardness RangeCorrosion ResistanceHigh Temperature PerformanceMachinability
1.2316 Stainless Tool Steel28–34 HRC★★★★★★★★★
D2 (1.2379)60–64 HRC★★★★
H13 (1.2344)50–55 HRC★★★★★★★★
P20 (1.2311)28–32 HRC★★★★★★

Practical operating tips for machining 1.2316 Stainless Tool Steel

TiAlN coated carbide tools are advised for cutting with a cutting speed of 80–120 m/min and feed rate of 0.1–0.2 mm per tooth. Martensitic stainless steel has a stronger work hardening effect than ordinary carbon steel, so tools must remain sharp to prevent repeated friction on machined surfaces. After EDM work, low-temperature tempering at 200°C for two hours can remove stress from the white recast layer and stop microcracks from expanding during mold operation. For repair welding, matching steel welding rods or E309Mo stainless steel electrodes are recommended, and local stress relief treatment should be carried out after welding. If higher hardness is required, full machining can be followed by quenching (austenitizing at 1030–1050°C with oil or air cooling) and tempering at 200–400°C to reach the target hardness of 40–48 HRC.

Ideal Application Scenarios of 1.2316 Stainless Tool Steel

The best suitable uses for 1.2316 stainless tool steel cover PVC and CPVC injection molds where chlorine-containing plastics demand anti-corrosion performance, molds for medical devices and lab supplies that meet both hygiene and anti-rust standards, food packaging and tableware molds complying with safety rules for food contact materials, as well as molds operated in coastal or high humidity areas without rust risks during storage downtime. It is not recommended for high-temperature die casting molds that need H13 when working temperature exceeds 300°C, cold stamping molds requiring hardness above 60 HRC where D2 or DC53 is a better pick, and general plastic molds with strict ultra-low budget for PP and PE production that only need P20. There is one simple judgment rule: check whether corrosion exists in working conditions. If no corrosion risk appears, the cost advantage of 1.2316 corrosion resistant tool steel cannot beat cheaper non-stainless mold steel like P20.

FAQ:

Q1: Can 1.2316 Stainless Tool Steel be used for stamping molds?

A: It is generally not recommended. Stamping molds usually require high hardness of 58–64 HRC, while the maximum hardness of 1.2316 tool steel after quenching is around 48 HRC, whose wear resistance fails to sustain mass stamping production. It is an optional choice only if you stamp ultra-thin sheets under 0.3 mm with anti-corrosion demands, and full performance evaluation is required in advance.

A: Austenitize at 1030–1050°C, then quench by oil cooling or gas cooling, and adjust hardness via different tempering temperatures: temper at 200°C to get 46–48 HRC, 300°C for roughly 42–44 HRC, and 400°C for about 38–42 HRC. Do not temper above 450°C to avoid the temper brittleness range. The pre-hardened grade of 28–34 HRC is sufficient for most injection molding applications.

A: Their chemical composition ranges overlap, yet they are not fully equivalent. DIN 1.2316 stainless tool steel is manufactured in line with German standards with P ≤0.030% and S ≤0.020%; domestic 3Cr17NiMo complies with GB/T 1299, also with P ≤0.030% and S ≤0.020%. The practical gaps mainly lie in smelting processes and forging quality. You are advised to compare material test certificates and supplier processing capacity before purchase.

Conclusion

If you cannot decide between 1.2316 and other tool steels, especially when struggling to judge material options for corrosive working conditions, feel free to consult engineers at Keyspark Steel. With 20 years of industry experience, we can match suitable steel grades to your actual working scenarios and help you avoid unnecessary costs caused by wrong material selection.

 

📧 Email: Sales@keysparksteel.com
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