OHNS Carbon Steel (Oil-Hardening Non-Shrinking Steel): Composition, Properties, Applications & Price in India

OHNS steel (short for Oil-Hardening Non-Shrinking Steel) is a popular cold work tool steel grade used in manufacturing cutting tools, punches, dies, blades, and gauges. Known for its excellent dimensional stability, wear resistance, and hardenability, OHNS is widely used in tool rooms, die-making, and metal stamping industries.

This in-depth blog explores everything you need to know about OHNS carbon tool steel — including its chemical composition, mechanical properties, heat treatment, applications, prices, and top suppliers in India.

🧾 What is OHNS Carbon Steel?

OHNS (Oil-Hardening Non-Shrinking) tool steel belongs to the O1 tool steel family. It is a high-carbon, high-chromium cold work tool steel, formulated to provide dimensional stability after heat treatment, excellent toughness, and abrasion resistance.

OHNS is hardened using oil quenching and exhibits minimal distortion during hardening, making it ideal for applications requiring high precision.

🧪 Chemical Composition of OHNS Steel

💡 Tungsten and chromium improve wear resistance and toughness, while vanadium enhances grain refinement.

⚙️ Mechanical Properties of OHNS Tool Steel

🔩 OHNS retains hardness and dimensional accuracy even under repeated use and stress.

🔥 Heat Treatment Process of OHNS Steel

✅ Recommended Heat Treatment Steps:

1. Annealing:
   Heat to 760–790°C, then cool slowly in the furnace

2. Hardening:
   Heat uniformly to 780–820°C, then quench in warm oil

3. Tempering:
   Temper immediately after hardening at 150–300°C based on desired hardness

4. Stress Relieving:
   Done at ~600°C to reduce internal stress

🛠️ Double tempering is often performed for improved toughness and wear life.

📦 Forms Available in OHNS Steel

OHNS tool steel is widely available in the following product forms:

• Round Bars

• Flat Bars

• Square Bars

• Forged Blocks

• Cut Pieces for Dies & Tools

📏 Sizes:

• Round Bars: 10 mm – 300 mm

• Flat Bars: Custom cut sizes

• Length: 2 to 6 meters or cut to length

🧰 Applications of OHNS Carbon Steel

OHNS is ideal for cold work tooling applications that demand durability, hardness, and dimensional stability.

✅ Common Uses:

• ⚙️ Cold punches and dies

• 🔩 Shear blades

• 🧰 Gauges and fixtures

• ✂️ Knives and cutting tools

• 🛠 Stamping and pressing tools

• 🧱 Drawing and forming tools

• 🗜 Reamers and broaches

📌 OHNS is perfect for tool applications involving moderate shock loads and wear.

🔁 OHNS Equivalent Grades

🌍 OHNS and AISI O1 are often used interchangeably in tooling industries globally.

💰 OHNS Tool Steel Price in India (Indicative)

📌 Prices vary based on size, shape, finish, and treatment. Bulk orders often receive better rates.

🧭 Trusted OHNS Steel Suppliers in India

Looking for reliable sources? Here are some top distributors and manufacturers:

• Triton Alloys Inc., Mumbai

• Virwadia Steels, Chennai

• Bright Steel Centre, Maharashtra

• Bhansali Inc., Gujarat

• Mohan Steels, Delhi NCR

• Panchdeep Metal Corporation, Mumbai

✅ Request Mill Test Certificates (MTC) and confirm heat treatment condition before placing large orders.

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✅ Conclusion

OHNS carbon tool steel is a reliable and cost-effective material for tooling applications requiring dimensional accuracy, abrasion resistance, and moderate toughness. It’s perfect for cold work dies, punches, blades, and form tools, and is known for its oil-hardening behavior and non-shrinking quality after heat treatment.

Available in various shapes and sizes from trusted Indian suppliers, OHNS is the go-to grade for tool rooms and precision workshops.

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