2 OHNS Round Bar Supplier Mumbai for Dies, Gauges and Tool Room Applications
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Meta Description: OHNS Round Bar Supplier Mumbai supplying oil hardening non-shrinking tool steel for dies, punches, gauges, guide components, cutting tools and industrial tooling.
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Table of Contents
- What Is OHNS Round Bar?
- OHNS Steel and AISI O1
- OHNS Round Bar Chemical Composition
- OHNS Mechanical Properties
- Why OHNS Steel Is Used for Tooling
- OHNS Round Bar Applications
- OHNS Heat Treatment
- OHNS Machining
- OHNS Round Bar Sizes and Finishes
- OHNS Round Bar Specifications
- What Affects OHNS Round Bar Price?
- How to Buy OHNS Round Bar
- OHNS Round Bar Supplier in Mumbai
- Frequently Asked Questions
- Request a Quote
What Is OHNS Round Bar?
OHNS Round Bar means Oil Hardening Non-Shrinking Round Bar. It is a tool-steel material used for components that require good hardness, wear resistance and dimensional stability after suitable heat treatment.
OHNS is commonly associated with AISI O1 and DIN 1.2510 / 100MnCrW4 designations, although the exact grade equivalence should always be confirmed against the applicable specification.
AISI O1 is classified as an oil-hardening cold-work tool steel. ASTM A681 covers standard requirements for wrought alloy tool steels, including oil-hardening tool-steel grades.
For a technical reference, ASTM A681 provides the recognized specification framework for tool steels.
OHNS Round Bar is commonly selected for:
- Blanking dies
- Punches
- Gauges
- Forming tools
- Cutting tools
- Knives
- Bushes
- Guide components
- Dies
- Precision tool-room parts
OHNS Steel and AISI O1
When purchasing OHNS, buyers will often encounter multiple designations.
| Designation | Common Reference |
|---|---|
| OHNS | Oil Hardening Non-Shrinking Steel |
| AISI O1 | Oil-hardening tool steel |
| DIN 1.2510 | Tool steel designation |
| 100MnCrW4 | European designation |
| JIS SKS3 | Japanese tool-steel designation |
These designations are commonly associated with the same general tool-steel family, but they should not automatically be treated as identical for every purchase.
The exact chemical composition, standard and required properties should be checked before substitution.
For an engineering purchase order, a suitable description is:
Material: OHNS Tool Steel
Grade: AISI O1 / DIN 1.2510, where applicable
Product: Round Bar
Diameter: Required size
Length: Required length
Condition: Annealed / Hardened & Tempered
Finish: Ground / Peeled / Turned / As Required
Quantity: Required quantity
For additional information about O1 tool steel, view the Tool Steel Service O1 technical reference.
OHNS Round Bar Chemical Composition
OHNS/O1 obtains its tooling characteristics from a combination of carbon, manganese, chromium, tungsten and other controlled alloying elements.
A commonly published AISI O1 composition is approximately:
| Element | Typical Content / Range |
|---|---|
| Carbon (C) | 0.85–1.00% |
| Manganese (Mn) | 1.00–1.40% |
| Silicon (Si) | 0.10–0.50% |
| Chromium (Cr) | 0.40–0.60% |
| Tungsten (W) | 0.40–0.60% |
| Vanadium (V) | Small / controlled addition |
| Phosphorus (P) | 0.03% max |
| Sulphur (S) | 0.03% max |
| Iron (Fe) | Balance |
Exact limits vary according to the applicable designation and product specification.
Published O1 data from Tool Steel Service identifies the grade as an oil-hardening tool steel and provides its typical alloy chemistry. See the O1 Tool Steel technical specification.
The actual chemistry of supplied OHNS Round Bar should always be verified through the Mill Test Certificate (MTC).
OHNS Mechanical Properties
OHNS is selected primarily for its ability to achieve high hardness and wear resistance after suitable heat treatment.
Mechanical performance depends heavily on:
- Bar diameter
- Heat-treatment process
- Austenitizing temperature
- Quenching method
- Tempering temperature
- Final hardness
For this reason, it is not appropriate to assign one tensile-strength value to every OHNS Round Bar.
The important properties for tool-room applications include:
| Property | Importance |
|---|---|
| Hardness | Resistance to indentation and wear |
| Wear Resistance | Tool life |
| Toughness | Resistance to cracking and impact |
| Dimensional Stability | Important for precision tooling |
| Hardenability | Ability to develop required hardness |
| Compressive Strength | Important for dies and forming tools |
Tool Steel Service describes O1 as a general-purpose oil-hardening tool steel used for a range of tooling and maintenance applications. Read the O1 Tool Steel characteristics.
For critical tooling, the required hardness should be stated in the purchase specification.
Why OHNS Steel Is Used for Tooling
The main attraction of OHNS is its combination of hardness, wear resistance and dimensional stability after heat treatment.
The “non-shrinking” description refers to the material’s relatively controlled dimensional behaviour during appropriate hardening compared with some other tool-steel options.
This is important when producing:
- Gauges
- Dies
- Punches
- Templates
- Forming tools
- Precision cutting tools
A tool that changes dimensions significantly during hardening can require additional grinding and correction.
OHNS is therefore useful where dimensional control is important.
However, the actual dimensional change depends on section geometry, heat-treatment practice and processing.
OHNS Round Bar Applications
Blanking Dies
OHNS can be used for selected blanking dies where hardness and wear resistance are required.
Punches
Punches can experience repeated impact and compressive loading. Properly heat-treated OHNS can provide suitable hardness for selected applications.
Gauges
The material is used for selected gauges where dimensional stability and wear resistance are important.
Forming Dies
OHNS Round Bar can be machined into forming and shaping tools.
Cutting Tools
Selected knives, cutters and tool-room cutting components can be made from oil-hardening tool steel.
Bushes and Guide Components
The high-hardness condition makes OHNS suitable for selected wear-resistant guide components and bushes.
Threading and Forming Tools
OHNS can be used for selected taps, dies and other tool-room components where its hardness characteristics are suitable.
Precision Tooling
Tool manufacturers and maintenance departments can use OHNS for components where dimensional stability during heat treatment is important.
OHNS Heat Treatment
Heat treatment is one of the most important stages in using OHNS Round Bar.
Soft Annealing
Annealing is generally used to provide a softer condition suitable for machining.
This is particularly useful when the round bar will be machined into a die or tool before hardening.
Hardening
OHNS/O1 is an oil-hardening tool steel.
The material is heated to the appropriate hardening temperature and then quenched in a suitable medium according to the selected heat-treatment procedure.
The exact temperature and holding time depend on the material specification and component geometry.
Tempering
After hardening, tempering is used to adjust the final balance between hardness and toughness.
The selected tempering temperature depends on the final application and required hardness.
Dimensional Control
Tool components should be designed with heat-treatment movement and grinding allowance in mind.
Large changes in geometry can increase the amount of post-hardening correction required.
For exact processing parameters, the applicable material supplier’s datasheet and heat-treatment procedure should be followed rather than using a generic internet temperature.
OHNS Machining
OHNS is generally machined in its annealed condition before hardening.
Common operations include:
- Turning
- Milling
- Drilling
- Boring
- Threading
- Grinding
Machining becomes significantly more demanding after the material is hardened.
This is why tool manufacturing commonly follows a sequence such as:
Annealed bar → Rough machining → Heat treatment → Grinding / finishing
The machining allowance should be planned carefully so sufficient material remains for final correction after heat treatment.
Grinding is particularly important for precision dies, gauges and hardened tool components.
OHNS Round Bar Sizes and Finishes
OHNS Round Bar may be supplied in different diameters and finishes depending on the tool-room requirement.
Common forms include:
Hot Rolled Round Bar
Suitable where machining allowance is acceptable.
Bright Round Bar
Useful where improved surface condition and dimensional control are required.
Peeled Round Bar
Provides a controlled surface and starting diameter.
Ground Round Bar
Suitable for precision requirements.
Centreless Ground Bar
Useful when tight dimensional tolerances are important.
Forged Round Bar
Used for selected larger-section requirements.
The required diameter, tolerance and finish should always be specified in the enquiry.
OHNS Round Bar Specifications
A complete OHNS purchase specification can include:
| Requirement | Example |
|---|---|
| Material | OHNS Tool Steel |
| Grade | AISI O1 / DIN 1.2510 |
| Product | Round Bar |
| Diameter | ___ mm |
| Length | ___ mm |
| Condition | Annealed / Hardened & Tempered |
| Finish | Bright / Ground / Peeled / Turned |
| Hardness | ___ HRC / As specified |
| Quantity | ___ kg / pieces |
| Testing | MTC / Hardness / Other |
| Application | Die / Gauge / Punch / Tool |
ASTM A681 is the relevant ASTM specification family for wrought tool steels, including oil-hardening grades.
For standards information, visit ASTM International.
What Affects OHNS Round Bar Price?
The OHNS Round Bar price depends on several technical and commercial factors.
Diameter
Larger diameters require more material and can involve different manufacturing processes.
Finish
Bright, peeled, turned and ground bars involve different levels of processing.
Tolerance
Precision-ground material generally costs more than standard machining stock.
Condition
Annealed and hardened material involve different processing requirements.
Heat Treatment
Customer-specific hardness or heat-treatment requirements can affect the final price.
Quantity
Bulk requirements may receive different commercial pricing from small quantities.
Testing
MTC, hardness testing, dimensional inspection and additional quality documentation can affect the quotation.
Availability
The availability of the required diameter and condition can influence both delivery time and cost.
For an accurate OHNS Round Bar price in Mumbai, provide the complete specification instead of requesting only a generic rate per kilogram.
How to Buy OHNS Round Bar
For an industrial enquiry, provide:
Material: OHNS / AISI O1
Grade: ___
Diameter: ___ mm
Length: ___ mm
Condition: Annealed / As Required
Finish: Ground / Peeled / Bright / Turned
Required Hardness: ___ HRC
Quantity: ___ kg / pieces
Testing: ___
Application: Die / Punch / Gauge / Tool / Other
For precision tool-room applications, include the finished component dimensions and heat-treatment requirement where possible.
This makes it easier to determine the suitable starting bar size.
OHNS Round Bar Supplier in Mumbai
For companies searching for an OHNS Round Bar Supplier Mumbai, Manan Steel & Metals supplies engineering and tool-steel round bars for industrial requirements.
The company’s published round-bar range includes OHNS Round Bar along with a broad selection of engineering and specialty materials.
View the Manan Steel & Metals Round Bar range.
For an OHNS enquiry, mention:
OHNS / AISI O1 / applicable designation
Diameter
Length
Condition
Finish
Required hardness
Quantity
Testing
Application
This helps distinguish a tooling requirement from a general steel round-bar enquiry.
Frequently Asked Questions
What does OHNS stand for?
OHNS stands for Oil Hardening Non-Shrinking Steel. It is a tool-steel material used for dies, gauges, punches and other tooling applications.
What is the equivalent of OHNS steel?
OHNS is commonly associated with AISI O1 and DIN 1.2510 / 100MnCrW4. Exact equivalence should be confirmed against the applicable specification.
Is OHNS a tool steel?
Yes. OHNS is used as an oil-hardening tool steel for cold-work tooling and precision components.
What is OHNS Round Bar used for?
Typical applications include blanking dies, punches, gauges, forming tools, cutting tools, bushes, guide components and other tool-room parts.
Can OHNS Round Bar be hardened?
Yes. Oil-hardening tool steels such as O1 are designed to achieve high hardness through appropriate heat treatment.
Why is OHNS called non-shrinking?
The term refers to the material’s relatively controlled dimensional behaviour during suitable heat treatment. Actual dimensional movement still depends on geometry and heat-treatment practice.
Is OHNS suitable for CNC machining?
Yes. OHNS can be machined in an annealed condition using turning, milling, drilling and other operations. Hardened OHNS generally requires more specialized machining or grinding.
What affects OHNS Round Bar price?
Diameter, finish, tolerance, condition, hardness requirement, heat treatment, quantity, testing and availability can affect the final price.
How can I get an OHNS Round Bar quotation in Mumbai?
Send the required grade, diameter, length, condition, finish, hardness, quantity and application to Manan Steel & Metals.
Request a Quote for OHNS Round Bar
Manan Steel & Metals
Shop No. 2, Hira Building, 97 Khetwadi Main Road (Nanubhai Desai Road), Girgaon, Mumbai – 400004, Maharashtra, India
Phone: 7977369869
Email: manansteel@gmail.com
Website: www.manansteel.com
For a faster quotation, send:
Material: OHNS / AISI O1
Grade: ___
Diameter: ___ mm
Length: ___ mm
Condition: ___
Hardness: ___ HRC
Finish: ___
Quantity: ___ kg / pieces
Testing: ___
Application: ___
For tool-making requirements, provide the finished component or drawing specification whenever possible.