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Technical Specifications
Product Overview
12L14 Cold Rolled Steel Round Bar is a free-machining carbon steel with added lead and sulfur content for enhanced machinability. This leaded steel offers excellent machining characteristics while maintaining good mechanical properties, making it ideal for high-volume production applications requiring extensive machining operations.
Key Features:
- Exceptional machinability rating of 160% (AISI 1212 = 100%)
- Excellent surface finish capabilities
- Good dimensional stability during machining
- Reduced tool wear and longer tool life
- Cost-effective for high-volume production
Manufacturing Process: Cold rolled to precise dimensions with controlled surface finish. The cold working process improves dimensional accuracy and surface quality while increasing strength properties.
Applications: Automotive components, fasteners, pins, bushings, shafts, fittings, valve components, precision machined parts, and general machining applications where excellent machinability is required.
🧪 Chemical Composition
| Element | Min % | Max % | Typical % | ASTM A108 Requirement |
|---|---|---|---|---|
| Carbon (C) | 0.15 | 0.20 | 0.17 | 0.15-0.20 |
| Manganese (Mn) | 0.85 | 1.15 | 1.00 | 0.85-1.15 |
| Phosphorus (P) | 0.04 | 0.09 | 0.06 | 0.04-0.09 |
| Sulfur (S) | 0.26 | 0.35 | 0.30 | 0.26-0.35 |
| Lead (Pb) | 0.15 | 0.35 | 0.25 | 0.15-0.35 |
| Silicon (Si) | - | 0.30 | 0.15 | ≤ 0.30 |
| Chromium (Cr) | - | 0.20 | 0.10 | ≤ 0.20 |
| Nickel (Ni) | - | 0.25 | 0.12 | ≤ 0.25 |
| Iron (Fe) | Balance | Balance | 97.8 | Balance |
⚙️ Mechanical Properties
| Property | ASTM Requirement | Typical Value | Test Method | Temperature |
|---|---|---|---|---|
| Tensile Strength | 78 ksi min | 85 ksi | ASTM A370 | Room Temp |
| Yield Strength (0.2%) | 67 ksi min | 72 ksi | ASTM A370 | Room Temp |
| Elongation | 10% min | 12% | ASTM A370 | Room Temp |
| Reduction of Area | 35% min | 40% | ASTM A370 | Room Temp |
| Hardness (Brinell) | 170-229 HB | 200 HB | ASTM E10 | Room Temp |
| Hardness (Rockwell B) | 88-99 HRB | 95 HRB | ASTM E18 | Room Temp |
| Modulus of Elasticity | - | 205 GPa | ASTM E111 | Room Temp |
| Machinability Rating | - | 160% | AISI 1212 = 100% | Room Temp |
🔬 Physical Properties
| Property | Value | Unit | Temperature | Test Standard |
|---|---|---|---|---|
| Density | 7.87 | g/cm3 | 20¡ãC | ASTM B311 |
| Melting Point | 1480-1530 | ¡ãC | - | DSC Analysis |
| Thermal Conductivity | 51.9 | W/m·K | 100¡ãC | ASTM E1461 |
| Specific Heat | 486 | J/kg·K | 0-100¡ãC | ASTM C351 |
| Linear Expansion | 11.7 | μm/m·K | 0-100¡ãC | ASTM E228 |
| Electrical Resistivity | 162 | nΩ·m | 20¡ãC | ASTM B193 |
| Magnetic Permeability | Ferromagnetic | - | Room Temp | ASTM A342 |
| Curie Temperature | 770 | ¡ãC | - | Magnetic analysis |
📏 Product Specifications
| Specification | Available Range | Standard Length | Custom Available | Tolerance |
|---|---|---|---|---|
| Diameter | 3mm - 300mm | Various | Yes | ±0.05mm to ±0.5mm |
| Length | 1m - 12m | 6m | Yes | +25mm/-0mm |
| Surface Finish | Cold Rolled, Turned, Ground | Cold Rolled | Yes | Ra ≤ 1.6μm |
| Straightness | 0.5mm/m max | Standard | Precision available | ASTM A108 |
| Cross Section | Round | Round | Custom shapes | ±0.1mm |
| End Condition | Saw Cut, Machined | Saw Cut | Yes | Square ±1¡ã |
| Standards Compliance | ASTM A108, SAE J403 | ASTM A108 | Multiple | Full compliance |
| Heat Treatment | Cold Drawn, Stress Relieved | Cold Drawn | Yes | As specified |
| Test Certificate | Mill TC, Chemical Analysis | Mill TC | Yes | Standard |
| Packaging | Bundles, Boxes, Pallets | Bundles | Custom | Export standard |
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Our Advantages in Processing 12L14 เหล็กกล้ารีดเย็นแท่งกลม
Superior Machinability Performance
The cold-rolled process combined with lead content creates exceptional machinability, allowing for high-speed cutting operations with minimal tool wear and excellent surface finish, resulting in reduced production time and costs.
Precise Dimensional Control
Cold rolling produces tight dimensional tolerances and consistent roundness throughout the bar length, ensuring superior straightness and concentricity ideal for precision machined components and automated manufacturing.
Enhanced Surface Quality
The cold rolling manufacturing process delivers a smooth, polished surface finish with improved hardness and wear resistance, minimizing the need for additional finishing operations and ensuring better part quality.
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