4140 steel composition |4140 steel composition element | aisi 4140 steel composition alloy steel

Our company (Dongguan Songshun Die Steel Co., Ltd.) has been specializing in 4340 and 4140 alloy steel for more than 20 years in China, including alloy steel round steel, alloy steel square steel, alloy steel flat steel, square alloy steel and hexagonal alloy steel bar.

Description of 4140 steel: 4140 steel is an alloy structural steel. It is a general purpose high strength steel with moderate strength levels and good impact properties. This kind of steel belongs to medium hardenability steel, which has the advantages of high yield, good comprehensive mechanical properties, good strength, good toughness and high hardenability. The hardness is 241HB, 4140 has good strength and good comprehensive mechanical properties after heat treatment, and has good manufacturability. It can be used to make steam turbine fasteners, salvage tools, etc.

4140 steel application: 4140 steel bar is mainly used to produce high-strength stud bolts, screws, wind power bolts, prestressed anchor bolts, post-stressed anchor bolts, steel tie rods, tie rods, tie rods, tie rods, etc. Crankshaft, quill shaft, linear shaft, pump shaft, rotor shaft, sensor shaft, spline shaft, drive shaft, mandrel, drive shaft, screw, etc. CNC machine tools, precision CNC machine tools, etc. Thimble and ejector rod.

4140 Steel Features:This steel has good strength, good toughness, high hardenability, good workability, small processing deformation, quite good fatigue resistance, small deformation during quenching, and high creep strength and durable strength at high temperature.

4140 steel processing technology:

Heat treatment standard: quenching at 850℃, oil cooling; tempering at 560℃, water cooling, oil cooling;

Metallographic structure: tempered sorbite

Heat treatment:

1. Normalizing: Heat the furnace to 900°C~930°C, keep the thickest cross section per inch at this temperature for one hour, and cool in air.

2. Heat to austenitizing at a temperature of 860℃~885℃, and keep the thickest cross section per inch for one hour at this temperature

3. Normalizing or oil quenching, and cooling to a maximum temperature of 121°C

4. Temper at a temperature that achieves the following mechanical properties. The thickest cross-section per inch is held for one hour at the tempering temperature, and the tempering temperature range is 640 ° C ~ 680 ° C

5. For each heat treatment process, a heat treatment chart must be drawn.

6. The mechanical property test shall be carried out in accordance with the stipulations of ASTM. A-370. The sample material used for the test shall be cut from the test bar of the same furnace steel. The casting or forging represented by the sample and the test bar shall be in the same furnace. The test bar shall be heat treated in the same furnace together with the charge.

7. The mechanical properties should meet the following requirements: (Tested with a test bar, sampling according to APT 6A, 110K standard) - Tensile strength minimum lb/inch (862) Yield strength minimum lb/inch 110.000 (758) 2 inches The minimum value of elongation is 15% and the minimum value of section shrinkage rate is %40. Brinell hardness HB285 ~ take, the casting or forging represented by the sample and the test bar must be in the same furnace, and the test bar should be heat treated in the same furnace together with the charge.

8. The mechanical properties should meet the following requirements: (tested with test bars, sampling according to APT 6A, 110K standard) - minimum tensile strength lbs/inch (862) minimum yield strength lbs/inch (758) 2 inches Minimum elongation %15 Minimum shrinkage of section %40 Brinell hardness HB285~352

9. Marking: Each part shall be printed with heat treatment marks and hardness with low stress steel stamp.

Company Overview

  Established in 2009,Songshun Steel supplies a wide range of carbon, alloy and tool steel products, including high speed tool steel, cold work tool steel, hot work tool steel, plastic mould steel, engineering steel and machine structural steel etc. After more than 10 years development and growing, Songshun Steel becomes one comprehensive special steel factory, stockist and exporter.

Contact Us

We provide high-quality steel, ex-factory price, support customization, strong company and factory strength; welcome your inquiry and order；please contact us for quotes.

MiKi Zhuo

E-mail:[email]

Skype/Whatsapp/Wechat:+86-18269260283

ADD:No.4 Dongda Street, Shatou, Changan Town, Dongguan City, Guangdong Province, P.R.C China

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