AISI 4145 SCM445 Alloy Hot Forged Hollow Bar

AISI 4145 SCM445 Alloy Hot Forged Hollow Bar

1: AISI 4145 Steel Introduction

4145 Steel is a high quality Quenched and Tempered Alloy Structural steel, It belong to the high quality medium carbon, Oil Quenched & Tempered Hardenss is 28-34 HRc.4145 Annealing delivery hardenss less than 250HB.
AISI 4145 Alloy structural steel, we can supply the 4145 round bar, steel flat bar, plate, hexagonal steel bar and steel square block. 4145 steel Round bar can be sawn to your required lengths as one offs or multiple cut pieces. 4145 Rectangular pieces can be sawn from flat bar or plate to your specific sizes.

4145 Steel Stock In Warehouse

2: AISI 4145 Quality Standard

AISI 4145 steel according to ASTM A29.

3: AISI 4145 Steel Equivalent

4: AISI 4145 Steel Chemical Composition

5: AISI 4145 Steel Mechanical Properties

The mechanical properties mainly include tensile strength, yield strength, elongation, area or reduction, hardness, impact value, non-metalic inclusion etc. Different heat treatment, the mechanical properties will be different, such as normalized, tempered, QT. If you want to know the properties, kindly contact the salesman.

6: AISI 4145 Steel Overviews

7: AISI 4145 Steel Application

ASTM 4140 steel finds many applications as forgings for the aerospace,oil and gas,automotive, agricultural and defense industries etc.
Typical applications for 4140 steel uses include:forged gears,spindles,fixtures,jigs,collars,Axles,conveyor parts,crow bars,logging parts,shafts,sprockets,studs,pinions,pump shafts, rams, and ring gears etc.

8: AISI 4145 Steel Heat Treatment

Annealing
Heat ASTM 4140 steels to 800 ℃ – 850℃, hold until temperature is uniform throughout the section and cool in furnace.
Normalizing
Heat steel alloy 4140 to 870 ℃ – 900 ℃, hold until temperature is uniform throughout the section, soak for 10 – 15 minutes and cool in still air.
Tempering
Re-heat 4140 grade steel to 550 ℃ – 700 ℃ as required, hold until temperature is uniform throughout the section, soak for 1 hour per 25 mm of section, and cool in still air.
Hardening
AISI alloy 4140 steel bar, plate and square can be hardened by cold working, or heating and quenching.

SAE 4140 alloy steel is usually supplied ready heat treated to hardness in 18-22 HRC. If further heat treatment is required, then heat to 840 ℃ – 875 ℃, hold until temperature is uniform throughout the section, soak for 10 – 15 minutes per 25 mm section, and quench in oil, water, or polymer as required.

9: AISI 4145 Steel Tolerance

10: Delivery Condition

For hot forged or hot rolled bar, usually the delivery condition is hot forged or rolled, annealed or QT, black surface or rough turned.
For hot forged plate, usually the delivery condition is hot forged, annealed or QT, milled surface.
For hot rolled plate, usually the delivery condition is hot rolled, annealed or QT, black surface.