Jethete M152 Stainless Steel Bars / Aerospace M152 Round Bar / Jethete M152 Rods/Rings

Product Description

Jethete M152 Stainless Steel (Aerospace Series)

Jethete M152 is a high-performance, martensitic stainless steel strengthened by additions of nitrogen, vanadium, and molybdenum. It was specifically engineered for the aerospace and power generation industries to bridge the gap between standard 12% Chromium steels and more expensive superalloys.

It is renowned for its excellent fracture toughness, high creep-rupture strength, and stability at elevated temperatures, making it a "gold standard" for rotating components in gas turbines.

Technical Specifications & Equivalents

M152 is a specialized alloy often governed by strict aerospace and industrial standards to ensure structural integrity in high-stress environments.

Key Mechanical Properties

Jethete M152 is valued for its ability to maintain high tensile strength while retaining significant ductility and impact resistance at temperatures up to 560°C (1040°F).

• Tensile Strength ($R_m$): 850–1150 MPa (depending on tempering)

• 0.2% Proof Stress ($R_{p0.2}$): $\ge$ 650 MPa

• Elongation ($A$): $\ge$ 15%

• Fracture Toughness: Exceptional for a martensitic stainless steel, even at high strength levels.

Product Forms & Typical Uses

1. Round Bars & Rods

M152 rods are typically supplied in the hardened and tempered condition. They are often used for components subjected to high fatigue and thermal stress.

• Applications: High-strength fasteners, structural bolts, and actuator shafts.

2. Rings & Forgings

Rings are frequently manufactured using seamless rolled ring forging to optimize the grain flow for rotating parts.

• Applications: Turbine discs, compressor casings, and spacer rings in jet engines and industrial gas turbines.

Distinctive Characteristics

• Creep Resistance: Unlike standard 400-series stainless steels, M152 maintains its shape and strength under constant load at high temperatures over long periods.

• Corrosion Resistance: Offers moderate corrosion resistance, superior to many other high-strength low-alloy steels, though it is primarily selected for its mechanical properties rather than chemical inertness.

• Thermal Expansion: It has a low coefficient of thermal expansion, which helps maintain tight tolerances in jet engine assemblies during thermal cycling.

Processing & Fabrication

• Heat Treatment: The alloy is typically hardened by air or oil quenching from 1050°C and then double-tempered (usually between 650°C and 700°C) to achieve the optimal balance of strength and toughness.

• Machinability: M152 is considered "fair" to machine. Due to its high alloy content, it is more difficult than standard AISI 410 but easier than nickel-based superalloys. Rigid setups and high-quality carbide tooling are essential.

• Welding: Weldable with care; however, because it is a martensitic air-hardening steel, pre-heating and post-weld heat treatment (PWHT) are mandatory to prevent hydrogen cracking and restore ductility in the heat-affected zone (HAZ).