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Stainless Steel Jethete M-152

Jethete M-152 is a nitrogen bearing, hardenable 12% chromium martensitic stainless steel with high strength at higher temperatures, and excellent creep and corrosion resistance. It is supplied as hardened and tempered steel with very good toughness, creep rupture properties and temper resistance at temperatures up to 1040° F (560° C).

This alloy also shows high notch tolerance, good thermal expansion coefficients, and it maintains constant feeds and speeds when machined.

Due to its excellent mechanical properties at higher temperatures and good machining properties, Jethete M-152 can be used in high-stress environments, such as turbine blades and turbine discs in the aerospace industry, as well as screws, shafts, bolts, pings and rings used in high heat environments.

Thanks to the outstanding creep rupture strength, Jethete M-152 also finds use in mechanical parts, mechanical gears and drilling equipment. Jethete M-152 is similar to M-151 in most ways, with the difference being that the latter is mostly used for welding.

Tech Steel & Materials offers Stainless Steel Jethete M-152 in two sub-type specifications that differ by the heat treatment used, and multiple shapes and forms:

  • AMS 5718 (Bar, Forging, Ring, and Tubing)
  • AMS 5719 (Bar, Extrusion, Forging, Ring, Tubing, and Wire)

Chemical Composition of Stainless Steel Jethete M-152

Element Min (%) Max (%)
Carbon, C 0.08 0.13
Manganese, Mn 0.50 0.90
Silicon, Si 0.35
Sulfur, S 0.025
Phosphorus, P 0.030
Chromium, Cr 11 12.50
Nitrogen, N 0.02 0.04
Nickel, Ni 2 3
Molybdenum, Mo 1.50 2.00
Vanadium, V 0.25 0.40
Iron, Fe *Balance

*Not exclusively to the element mentioned, but that one predominates other elements that are used only in minimal quantities.

Fabrication and Working Instructions

Jethete M-152 can be easily bent, drawn or spun in the once annealed state, maintaining constant feeds and speeds.

This alloy can also be very easily forged with the following treatment:

  • Preheat the part to 1400-1450° F (760-788° C), followed by quick superheating to temperatures of 2050-2102° F (1121-1150° C). Then cool and forge at temperatures above 1450° F (788° C).
  • After forging, air cool the part to 212° F (100° C), followed by quick annealing at 1256-1292° F (680-700° C). Air cool to room temperature to get the finalized forget part.

Jethete M-152 can be readily welded using the AMS 5719 specification welding wire. It can also be melted using AOD + ESR or AOD + VAR methods.

Mechanical Properties of Jethete M-152 (heat treated)

Property Value
Tensile Strength, min 135 ksi
Yield Strength at 0.2% Offset, min 110 ksi
Elongation in 4D, min 17%
Reduction of Area, min 30%
Impact Strength 120 J/CM2
Hardness, Brinell 326
Hardness, Rockwell C 35
Hardness, Knoop 354

Physical Properties of Jethete M-152

Physical Properties Imperial Metric
Density 0.28 lb/in³ 7.75 g/cc

Heat Treatment

Jethete M-152 is supplied in two specifications that differ by the heat treating used and thus the physical and mechanical properties. Generally, this alloy can be annealed at 1300° F (705° C) for four hours and then air cooled to room temperature. For hardening, the parts should be heated to 1800-1925° F (982-1051° C), while tempering is done in the temperature range of 750-1300° F (400-705° C).

The first specification with AMS 5718 number is mostly used in parts that are used as structural components. This specification comes in the annealed state (treatment listed below) and can be heat treated further using hardening and tempering to achieve the desired hardness, toughness and creep rupture properties:

  • Annealing – heat to the temperature of 1276° F (691° C) and keep for six hours. Then, air cool to room temperature.

The second specification with AMS 5719 number is mostly used in the aerospace industry in high-temperature environments and has the same heat treatment. This specification differs from AMS 5718 by its double tempering process which gives the part additional hardness and elasticity.

  • Annealing – heat to the temperature of 1276° F (691° C) and keep for six hours. Then, air cool to room temperature.
  • Hardening – heat to 1925° F (1052° C) and keep for 30 minutes. Then use oil quenching to cool the part.
  • Tempering – heat to 1040-1094° F (560-590° C) and keep for at least one hour. Then air cool to room temperature.
  • Second tempering – heat to 1000-1040° F (538-560° C) and keep at that temperature for 3 hours. Then, air cool the part to room temperature.