AISI 12L14
While primarily used in screw machining for small precision parts, it is occasionally employed in forging applications where high-speed machining and tight tolerances are critical.
Descriptions
1. Chemical Composition
AISI 12L14 is distinguished by its sulfur and lead additives, which enhance machinability. Its composition (weight %) is as follows:
| Element | Content (%) |
| Carbon (C) | 0.10-0.15 |
| Manganese (Mn) | 0.85-1.15 |
| Phosphorus (P) | 0.04-0.09 |
| Sulfur (S) | 0.26-0.35 |
| Lead (Pb) | 0.15-0.35 |
| Iron (Fe) | Balance |
2. Mechanical Properties
AISI 12L14 has relatively low strength compared to non-leaded steels, making it unsuitable for high-stress applications. Typical properties for cold-finished (as-forged or annealed) material include:
| Property | Value |
| Tensile Strength | 415-540MPa (60-78 ksi) |
| Yield Strength | 345-485 MPa(50-70 ksi) |
| Elongation (50mm) | 10-15% |
| Hardness | 85-100 HRB (Rockwell B) |
| Impact Energy (Charpy V-notch) | <15 J (low toughness) |
3. Key Advantages
Best-in-class machinability (lead reduces tool wear and improves chip breaking).
Excellent surface finish post-machining.
Cost-effective for high-volume, precision small parts.
4. Limitations
Low Strength: Unsuitable for load-bearing or dynamic stress applications.
Poor Weldability: Lead causes hot cracking; welding is generally avoided.
Environmental Concerns: Lead toxicity requires proper handling and disposal.
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CONTACT US
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Email Address
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Standards & Certifications
ASTM A29/A29M (Standard Specification for Steel Bars).
SAE J403 (Chemical Composition of Carbon Steels).
RoHS Compliance: Not compliant due to lead content (restricted in electronics and EU markets).
Applications
a. Instrumentation and Control Systems
Sensor Housings:
Precision-machined enclosures for pressure or temperature sensors in non-corrosive environments.Connectors and Fittings:
Small hydraulic or pneumatic fittings requiring tight tolerances (e.g., gauge ports).
b. Surface Equipment
Fasteners and Bushings:
Low-load bolts, washers, and bushings for assembly of non-pressure-retaining parts.Valve Trim Components:
Non-wetted parts like valve stems or handles in low-pressure systems.
c. Temporary Tools
Jigs and Fixtures:
Machined fixtures for assembly lines or maintenance operations.
d. Limitations in Oil & Gas
a. Material Handling Systems
Conveyor Components:
Guides, brackets, or rollers for lightweight conveyor systems in non-abrasive environments.Fasteners and Pins:
Custom-machined pins or clips for equipment assembly.
b. Drilling Support Tools
Surveying Equipment Parts:
Precision components for borehole measurement tools.Lubrication System Fittings:
Small fittings or nozzles for grease/oil delivery systems.
c. Maintenance and Repair
Prototype Components:
Rapidly machined prototypes for testing or temporary fixes.Wear Plate Inserts:
Low-cost inserts for non-critical wear surfaces (e.g., chute liners in coal handling).
d. Limitations in Mining
Unsuitable for high-impact or abrasive applications (e.g., crusher jaws, bucket teeth).
Limited service life in dusty or wet environments due to corrosion susceptibility.
Automotive: Fuel system fittings, sensor housings, and bushings.
Electronics: Connectors, terminals, and small fasteners.
Plumbing: Valve stems, compression fittings, and threaded nipples.
