Premium P20 Steel Round Bar Supplier in Mumbai
Jini Enterprise is a trusted P20 steel round bar supplier in Mumbai, offering genuine AISI P20 (1.2311) and P20+Ni (1.2738) pre-hardened mould steel round bars for the plastic injection moulding industry. P20 round bars are the go-to choice for mould cores, cavity inserts, guide pins, ejector pins, and mould components, thanks to their excellent polishability, machinability, and uniform hardness in the pre-hardened condition. Whether you need a small bar for a precision insert or a large-diameter bar for a mould core, we supply certified material cut to your exact length.
As a dedicated round bar supplier in Mumbai's steel trading hub, we stock P20 bars from 10mm to 450mm diameter in peeled, turned, and ground conditions. Every consignment comes with a Mill Test Certificate, and spectro and hardness verification are available on request. From single pieces to bulk orders, Jini Enterprise is your reliable partner for P20 steel round bars in Mumbai.
🧊 Why P20 Round Bars Are Preferred for Plastic Moulds
P20 round bars offer the ideal combination of properties for demanding mould-making applications:
✔ Pre-Hardened Delivery
Supplied in hardened and tempered condition (28-32 HRC / 280-320 HB), ready for immediate machining of round bars into cores, pins, and inserts.
✔ Excellent Polishability
Round bars can be polished to a high gloss finish—meeting the requirements of high-quality plastic parts and appearance surfaces.
✔ Superior Machinability
Excellent machinability enables efficient turning, milling, and drilling of round bars into complex mould components.
✔ Uniform Hardness & Dimensional Stability
Uniform hardness through large sections and good dimensional stability ensure consistent performance in large-diameter bars.
✔ Good Toughness & Wear Resistance
Characterized by good toughness at moderate strength levels, with proven performance in demanding moulding applications.
✔ Versatile Bar Forms
Available in peeled, turned, and precision ground conditions to suit your machining and mould-making requirements.
🔩 Applications – Where P20 Round Bars Excel
P20 round bars are widely used across the following mould-making applications:
🔘 Mould Cores & Inserts
- Core Pins – Machined from round bars
- Cavity Inserts – Replaceable mould components
- Core Inserts – Mould core details
- Thread Inserts – Mould threaded components
⚙️ Mould Components
- Guide Pins & Bushings – Mould alignment
- Ejector Pins & Sleeves – Part ejection
- Return Pins – Mould resetting
- Leader Pins – Mould guiding
🏭 General Mould Making
- Mould Bases – Round bar components
- Support Pillars – Mould support
- Locating Rings – Mould positioning
- Spring Guide Pins – Mould mechanisms
🔧 Tooling & Fixtures
- Jigs & Fixtures – Machined from round bars
- Gauges – Precision measurement tools
- Machine Components – General tooling
- Custom Parts – Machined to drawing
📏 P20 Round Bar Size Range – Diameters We Stock
| Diameter Range |
Typical Condition |
Common Applications |
| 10mm – 50mm | Peeled / Turned / Ground | Core pins, ejector pins, guide pins |
| 50mm – 150mm | Peeled / Turned | Cavity inserts, core inserts, support pillars |
| 150mm – 300mm | Peeled / Black | Large core inserts, mould cores |
| 300mm – 450mm | Black / Machined | Heavy mould components, large inserts |
✔ Custom diameters and cut-to-length sizes available on request. All bars supplied with dimensional inspection reports.
📊 Chemical Composition – P20 (1.2311 / AISI P20)
| Element |
Symbol |
Content (%) |
| Carbon | C | 0.35 – 0.45 |
| Silicon | Si | 0.20 – 0.40 |
| Manganese | Mn | 1.30 – 1.60 |
| Chromium | Cr | 1.80 – 2.10 |
| Molybdenum | Mo | 0.15 – 0.25 |
⚙️ Heat Treatment Guidelines for P20 Round Bars
P20 round bars are typically supplied in the pre-hardened condition. After machining, if heat treatment is required, follow these guidelines:
Soft Annealing
Heat to 710 – 740°C, cool slowly in furnace.
Achieves maximum Brinell hardness of ≤ 235 HB.
Stress Relieving
Heat to approx. 650°C, hold for 1-2 hours, air cool.
Removes machining stresses from turned bars.
Hardening
Austenitize at 840 – 870°C.
Quench in polymer or oil (depending on bar diameter).
Hardness after quenching: approx. 51 HRC.
Tempering
Temper at 482 – 593°C.
Achieves Rockwell C hardness of 28 – 37 HRC.
Typical working hardness: 28 – 32 HRC (in pre-hardened condition).
📐 Available Bar Conditions & Cut Lengths
🔘 Peeled / Turned Bars
✨ Precision Ground Bars (TGP)
⚫ Black / Hot Rolled Bars
📏 Cut-to-Length Service
🧪 Machined Bars
✔ Custom lengths available. Tell us your required bar length and we will cut the material accordingly.
⚖️ P20 vs P20+Ni Round Bars – Which Grade is Right for Your Mould?
🔵 P20 (1.2311)
- Key Feature: Excellent polishability & machinability
- Hardness: 28 – 32 HRC (280-320 HB)
- Best For: General plastic moulds, small to medium-sized bars where cost-effectiveness is a priority
- Application Examples: Core pins, guide pins, ejector pins, small inserts
🟡 P20+Ni (1.2738)
- Key Feature: Enhanced toughness & through-hardening for large sections
- Hardness: 30 – 34 HRC (300-340 HB)
- Best For: Large-diameter bars, thick sections, high-volume production, applications requiring superior toughness
- Application Examples: Large core inserts, mould cores, heavy support pillars
🌟 Why Choose Jini Enterprise for P20 Round Bars in Mumbai
🧊 Plastic Mould Steel Expertise
Deep understanding of P20 and P20+Ni properties—we help you select the right grade based on mould size, polishability, and toughness requirements.
🔬 Premium Quality & Consistency
Rigorous quality control ensures consistent mechanical properties, uniform hardness, and superior polishability across all bar diameters.
📦 Wide Size Range
P20 round bars from 10mm to 450mm diameter—covering everything from small core pins to large mould cores.
🚚 Pan-India Supply
Fast, reliable delivery to mould makers and plastic moulding companies across India from our Mumbai base.
🔬 Quality Assurance – Certified P20 Round Bars
✔ OES / Spectro Analysis
✔ Hardness (HRC / HB) Testing
✔ Ultrasonic (UT) Flaw Detection
✔ Microstructure & Carbide Check
✔ Polishability Test
✔ MTC (3.1 / EN 10204) Certified
📍 Based in Mumbai, Serving All of India: Sripati Castle Annex-1 C-103, 1st floor, Sripati Castle,
Balwant Kolhatkar Marg, Mumbai – 400004. We serve mould makers, plastic moulding companies, and tool rooms across Mumbai, Maharashtra, and all major industrial hubs in India.
📞 Looking for P20 Steel Round Bars in Mumbai? Get a Quote Today.
Partner with Jini Enterprise – your trusted P20 steel round bar supplier in Mumbai. We supply genuine AISI P20 (1.2311) and P20+Ni (1.2738) round bars from 10mm to 450mm diameter in peeled, turned, and ground conditions, backed by full certifications, competitive pricing, and pan-India delivery. Tell us your diameter and length requirement—we’ll respond with pricing and availability.
📧 Email: jinienterprise109@gmail.com
📞 Call Now: +91 865 591 6397