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What is the composition of 4340 steel?

What is the composition of 4340 steel?

AISI 4340 alloy steel is a heat treatable and low alloy steel containing chromium, nickel and molybdenum. It has high toughness and strength in the heat treated condition.

What does AISI 4340 mean?

AISI 4340 steel is defined as a heat treatable and low alloy steel which has 0.8% Cr, 0.2% Mo and 1.8% Ni as strengthening alloy elements. Compared with AISI 4140,it has higher strength and toughness,also it has very good fatigue resistance, wear resistance and atmospheric corrosion resistance.

Is AISI 4340 stainless steel?

Both AISI 304 stainless steel and SAE-AISI 4340 steel are iron alloys. For each property being compared, the top bar is AISI 304 stainless steel and the bottom bar is SAE-AISI 4340 steel.

What is the chromium content of AISI 4340 steel?

AISI / SAE 4340 Alloy Steel

Chemical Analysis
Si% Silicon 0.15 – 0.3
Ni% Nickel 1.65 – 2.0
Cr% Chromium 0.7 – 0.9
Mo% Molybdenum 0.2 – 0.3

Is AISI 4340 weldable?

Welding. This grade is readily welded in the annealed condition, but welding in the hardened and tempered condition should be avoided where possible because of the effect on mechanical properties. Welding in the nitrided or flame or induction hardened conditions is not recommended.

What does AISI 4130 mean?

AISI or SAE 4130 grade is a low-alloy steel containing chromium and molybdenum as strengthening agents. The steel has good strength and toughness, weldability and machinability. AISI/SAE 4130 grade is a versatile alloy with good atmospheric corrosion resistance and reasonable strength.

Which steel is used for welded assemblies?

The most commonly welded heat-treatable steels are 4130, 4340, and 8630. However, any steel prefaced with a 41, 43, or 86 is considered heat-treatable.

What is the recommended preheat temperature for AISI 4340 steel?

Typical uses include die-cast dies, crankshafts, gears, axles, forgings, castings, and buildup under harder weld deposits. A minimum preheat/interpass temperature of 600-800°F is recommended for AISI 4340. Allow the welded part to cool as slow as possible.

What are the principal alloying elements in AISI 4340 steel?

AISI 4340 (E4340) alloy steel is a medium carbon, low alloy steel known for providing a good balance between strength and malleability. Alloy 4340 is composed of (descending in order by weight): iron, nickel, chromium, manganese, carbon, molybdenum, silicon, phosphorus and sulfur.

What is the difference between 4140 and 4340 steel?

A: 4140 and 4340 steels both fall under the class of molybdenum and both contain 0.4% carbon. The difference between the two are molybdenum 41 steel has major constituents of chromium 0.95% and molybdenum 0.20%.

What is the yield strength for AISI 4340?

AISI 4340 Mechanical Properties Tensile strength 231-231 σb/MPa Yield Strength 154 σ 0.2 ≥/MPa Elongation 56 δ5≥(%) ψ – ψ≥(%) Akv – Akv≥/J HBS 235-268 – HRC 30 – AISI 4340 Heat Treatment Regime Annealing Quenching Tempering Normalizing Q & T √ √ √ √ √ AISI 4340 Range of products Product type Products Dimension Processes

What is the Rockwell hardness of 4340 steel?

This is an animated movie of the Rockwell C Hardness test on. 4340 Steel with a yield stress of 133,000 psi.