China 4140 42CrMo4 Grade Ut Test Qt Machined Peeled Hot Forged Bars

Alloy Steel Round Bar for Engineering 4140
1: AISI 4140 steel introduction
AISI 4140 is defined as a low alloy steel which has 1% Cr-Mo as strengthening alloy elements.Compared with AISI 4130, it has a higher carbon content with good balance of strength, toughness ,abrasion and impact resistance and heat treatment capabilities,but poor in weldability characteristics.AISI 4140 is generally supplied in quenched and tempered condition with hardness 28-32HRC

2: AISI 4140 Steel equivalent
CountryChinaJapanGermanyUSABritishStandardGB/T 3077JIS G4105DIN (W-Nr.)
EN 10250AISI/ASTM
ASTM A29BS 970Grade42CrMoSCM44042crmo4/1.72254140EN19/709M40
3: AISI 4140 steel chemical composition
GradeCSiMnPSCrMoNi42CrMo 0.38-0.450.17-0.370.5-0.80≤0.035≤0.0350.9-1.20.15-0.25- SCM440 0.38-0.430.15-0.350.6-0.85≤0.035≤0.040.9-1.20.15-0.30 - 42crmo4/1.7225 0.38-0.45≤ 0.4 0.6-0.9≤0.025≤0.0350.9-1.20.15-0.30 - 4140 0.38-0.430.15-0.350.75-1.00≤0.035≤0.040.8-1.10.15-0.25 - EN19/709M400.35-0.450.15-0.350.5-0.80≤0.035≤0.0350.9-1.50.2-0.40-
4: AISI 4140 steel mechanical properties(for guidance only)
GradeTensile strength
σb(MPa)Yield strength
σs (MPa)Elongation
δ5 (%)Reduction
ψ (%)Impact Value
Akv (J)Hardness4140 ≥1080≥930≥12≥45≥63 28-32HRC
5: AISI 4140 steel overviews
SizeRoundDia 6-1200mmPlate/Flat/BlockThickness
6mm-500mmWidth
20mm-1000mmHeat treatmentNormalized ; Annealed ; Quenched ; TemperedSurface conditionBlack; Peeled; Polished; Machined; Grinded; Turned; MilledDelivery conditionForged; Hot rolled; Cold drawnTestTensile strength, Yield strength, elongation, area of reduction, impact value, hardness, grain size, ultrasonic test, US inspection, magnetic particle testing, etc. Payment termsT/T;L/C;/Money gram/ PaypalTrade termsFOB; CIF; C&F; etc..Delivery time30-45 daysApplicationAISI 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
6: Delivery condition
For hot forged or hot rolled bar, usually the delivery condition is hot forged or rolled, annealed, rough turned.
For hot forged plate, usually the delivery condition is hot forged, annealed, milled surface.
For hot rolled plate, usually the delivery condition is hot rolled, annealed, black surface.
Hunan Qilu Industrial Co., Ltd has the capacity to forge round steel, steel flat, square steel, module, shaft and roller, etc. The main specifications of the products include Φ80-1000mm forging materials and 80-1200mm square billets and which the maximum piece weight can reach 50T.

Hunan Qilu Industrial Co., Ltd were already engaged in exporting steel for 11 years, could supply a great variety of hot forged, hot rolled and cold drawn Steels, including engineering steel, cold work tool steel, hot work tool steel, plastic mold steel, spring steel, high speed steel, stainless steel etc., besides Qilu Industrial also has their own heating treatment shop and machining shop to provide heating and cutting service.
Since 2008 year, Hunan Qilu Industrial has the right to export all FORGED STEEL behalf of Qilu Speical Steel Co.,ltd which is specialized in smelting and forging of special steel since 1965 year, now Qilu special steel is one of the biggest manufacturer of forged product in China.The forged products are used in Automotive, Aerospace, Power Generation, Oil & Gas, Transportation and Industrial. We already set up the warehouse in Wuxi and Dongguan city, more than 20000 tons ex-stock could be supplied with kinds of size.
Qilu Industrial is the professional one-stop steel manufacturer, stockist and exporter in China, our customers spread all over the world, include West Europe, North America, South America, Asia, Middle Asia, Africa, Australia, etc.

The company owns advanced special steel smelting facilities and forging processing equipments, the main steel-making equipment include 2 sets of 50t ultra-high power electric arc furnaces,2 sets of 60t LF refining furnaces,1 set of 60t vacuum degassing refining furnace and 4 sets of 1-20t electroslag re-melting furnaces.
The main forging equipments mainly include:3 sets of 5t electro-hydraulic hammers, 1 set of high-speed forging units of 800t,1600t,2000t and 4500t respectively.

Any interests in our company and products, please feel free to contact us for quotation. We warmly welcome you to our factory.
Hunan Qilu Industrial CO., LTD
Web: www.qilucs.com