4340M / 300M VAR Cr-Ni-Mo-V Aircraft Quality Alloy Steel

Description

Essentially 300M is a modified AISI 4340 steel with silicon, vanadium and slightly more carbon and molybdenum. 300M has a very good combination of strength at 1930–2100 MPa (280-305 ksi), toughness, fatigue strength and good ductility. It is a through hardening alloy.

Applications

Commonly used in applications that require strength in the 290 - 300 ksi range, such as aircraft landing gear, high strength bolts and airframe parts.

Specifications

UNS# K44220
AMS 2300 CLEANLINESS, PREMIUM AIRCRAFT-QUALITY MAGNETIC PARTICLE INSPECTION PROCEDURE
AMS 6417 STEEL, BARS, FORGINGS, AND TUBING, CONSUMABLE ELECTRODE VACUMN REMELT (0.39-0.43 C)
AMS 6419 STEEL, BARS, FORGINGS, AND TUBING, CONSUMABLE ELECTRODE VACUMN REMELT (0.40-0.45 C) 300M
AMS 6257 BARS, FORGINGS, AND TUBING, CONSUMABLE ELECTRODE VACUMN REMELT NORMALIZED & TEMPERED (0.40-0.44 C) 300M
A-579 (32) SUPER STRENGTH ALLOY STEEL FORGINGS
A-646 PREMIUM QUALITY ALLOY STEEL BLOOMS & BILLETS FOR AIRCRAFT & AEROSPACE FORGINGS
MIL-S-83135 STEEL BARS, REFORGING STOCK, AND MECHANICAL TUBING 4340M, HIGH QUALITY
MIL-S-8844-3 STEEL BARS, REFORGING STOCK & MECHANICAL TUBING, LOW ALLOY, PREMIUM QUALITY
BMS-7-26

Available Forms

• Bar
• Forge
• Rod