High Quality Hot Rolled Forged Steel Bar 4140 4340 Alloy Steel Round Bars
China High Quality Hot Rolled Forged Steel Bar 4140 4340 Alloy Steel Round Bars, Find details about China Forged Round Bars, Steel Round Bars from High Quality Hot Rolled Forged Steel Bar 4140 4340 Alloy Steel Round Bars
Basic Info.
Model NO.
4140 STEEL
Special Use
Mold Steel, Cold Heading Steel
Ut Test
Sep1921- Class C/C,D/D
PRO
Forged Steel Bars
Grades
AISI 4340 Steel / 36CrNiMo4 / 1.6511 / En24 / 817m
MOQ
1PC
Trademark
Laiwu Xincheng
Transport Package
Standard Seaworthy
Specification
200-1000mm
Origin
China
HS Code
72284000
Model NO.
4140 STEEL
Special Use
Mold Steel, Cold Heading Steel
Ut Test
Sep1921- Class C/C,D/D
PRO
Forged Steel Bars
Grades
AISI 4340 Steel / 36CrNiMo4 / 1.6511 / En24 / 817m
MOQ
1PC
Trademark
Laiwu Xincheng
Transport Package
Standard Seaworthy
Specification
200-1000mm
Origin
China
HS Code
72284000
Product Desciption
High quality hot rolled forged steel bar 4140 4340 alloy steel round bars
1.About 4340 Alloy Steel Bars:
4340 is a nickel-chromium-molybdenum alloy steel known for its toughness and its ability to attain high strengths in the heat-treated condition. It has very good fatigue resistance.
This alloy, 4340, may be heat treated to high strength levels while maintaining good toughness, wear resistance and fatigue strength levels, combined with good atmospheric corrosion resistance, and strength.
5.Inspecting:
UT according toSEP1921 C/c, D/d, E/e, A388 or GB/T 6402,
Spectral Tested, Microstructure Tested,Hardness Test,Macrostructure Test,
6.Delivery Condition:
Forged+black surface
Forged+rough machined
Forged+rough turned+QT/annealed/normalized
Surface condition: Black; Peeled; Polished; Machined; Grinded; Turned; Milled
7.Manufacture:EAF+LF+VD(Annealed,normalized,Quenched+Tempered,peeled,rough turned).
8.Heat Treatment: Normalized / Annealed / Quenched / tempered (optional)
Main Grade we can supply for forged steel bars
1.About 4340 Alloy Steel Bars:
4340 is a nickel-chromium-molybdenum alloy steel known for its toughness and its ability to attain high strengths in the heat-treated condition. It has very good fatigue resistance.
This alloy, 4340, may be heat treated to high strength levels while maintaining good toughness, wear resistance and fatigue strength levels, combined with good atmospheric corrosion resistance, and strength.
2. AISI 4340 Steel Specification and Relevant Standards
| Country | USA | Britain | Britain | Japan |
| Standard | ASTM A29 | EN 10250 | BS 970 | JIS G4103 |
| Grades | 4340 | 36CrNiMo4/ 1.6511 | EN24/817M40 | SNCM 439/SNCM8 |
3. ASTM 4340 Steels And Equilvalents Chemical Composition
| Standard | Grade | C | Mn | P | S | Si | Ni | Cr | Mo |
| ASTM A29 | 4340 | 0.38-0.43 | 0.60-0.80 | 0.035 | 0.040 | 0.15-0.35 | 1.65-2.00 | 0.70-0.90 | 0.20-0.30 |
| EN 10250 | 36CrNiMo4/ 1.6511 | 0.32-0.40 | 0.50-0.80 | 0.035 | 0.035 | <=0.40 | 0.90-1.20 | 0.90-1.2 | 0.15-0.30 |
| BS 970 | EN24/817M40 | 0.36-0.44 | 0.45-0.70 | 0.035 | 0.040 | 0.1-0.40 | 1.3-1.7 | 1.00-1.40 | 0.20-0.35 |
| JIS G4103 | SNCM 439/SNCM8 | 0.36-0.43 | 0.60-0.90 | 0.030 | 0.030 | 0.15-0.35 | 1.60-2.00 | 0.60-1.00 | 0.15-0.30 |
4. AISI Alloy 4340 Steel Mechanical Properties
| Mechannical Properties
(Heat Treated Condition ) | Condition | Ruling section mm | Tensile Strength MPa | Yield Strength MPa | Elong. % | Izod Impact J | Brinell Hardness |
| T | 250 | 850-1000 | 635 | 13 | 40 | 248-302 | |
| T | 150 | 850-1000 | 665 | 13 | 54 | 248-302 | |
| U | 100 | 930-1080 | 740 | 12 | 47 | 269-331 | |
| V | 63 | 1000-1150 | 835 | 12 | 47 | 293-352 | |
| W | 30 | 1080-1230 | 925 | 11 | 41 | 311-375 | |
| X | 30 | 1150-1300 | 1005 | 10 | 34 | 341-401 | |
| Y | 30 | 1230-1380 | 1080 | 10 | 24 | 363-429 | |
| Z | 30 | 1555- | 1125 | 5 | 10 | 444- | |
Thermal Properties
| Properties | Metric | Imperial |
| Thermal expansion co-efficient (20°C/68°F, specimen oil hardened, 600°C (1110°F) temper | 12.3 µm/m°C | 6.83 µin/in°F |
| Thermal conductivity (typical steel) | 44.5 W/mK | 309 BTU in/hr.ft².°F |
5.Forged Steel Size we can supply:
| Forged Steel Round Bar | Φ85mm~1200mm |
| Forged Square steel Bar: | 150×150-800×800mm |
| Forged Flat Blocks: | (150mm-800mm)*(200mm-800mm) |
| Forged Shaft and Forged Ring | According to Customer's drawing |
5.Inspecting:
UT according toSEP1921 C/c, D/d, E/e, A388 or GB/T 6402,
Spectral Tested, Microstructure Tested,Hardness Test,Macrostructure Test,
6.Delivery Condition:
Forged+black surface
Forged+rough machined
Forged+rough turned+QT/annealed/normalized
Surface condition: Black; Peeled; Polished; Machined; Grinded; Turned; Milled
7.Manufacture:EAF+LF+VD(Annealed,normalized,Quenched+Tempered,peeled,rough turned).
8.Heat Treatment: Normalized / Annealed / Quenched / tempered (optional)
Main Grade we can supply for forged steel bars
| Steel series | Representative steel type |
| Carbon Steel series | AISI 1020,1045,A36,S355JR,S355JO |
| Petroleum machinery series | AISI4150,AISI4140,AISI4130, |
| 30CrMo,4145H | |
| Tool mold series | 1.2714,5CrMnMo,5CrNiMoV, |
| 1.2738,1.2311,1.2312 1.2714 H13 | |
| Bearing series | 52100,GCr15,SUJ2 |
| Marine series | 4140,42CrMo,SCM440, |
| 709M40 | |
| Car series | SAE8620,20CrNiMo, |
| SNCM220 | |
| Heavy-duty transmission series | 40CrNiMo,SNCM439, |
| SAE4340,EN24 | |
| Mining machinery series | 655M13,826M40, |
| 25CrMo | |
| Wind power gear series | 18CrNiMo7-6, 17CrNiMo6, 1.6582,1.6587,SAE8620 |
| Wind power spindle series | 34CrNiMo6,817M40 |
| Nitriding series | 20MnCr5,38CrMoAl, |
| 31CrMoV9 | |
| Pressure vessel series | 15CrMo,13CrMo4-4 |
| Metallurgical roll series | 21CrMoV511,W1.7225, |
| EN19,709M40 |
About our factory:
Our main products include Forged Steel Round Bar from Sizes 85mm to 1100mm, Forged Steel Square Bar from Sizes 150×150 to 800×800mm with various grade ;The largest production steel ingot 15T, mainly forged alloy steel, carbon steel and other materials. The annual output of forged round can reach 60,000 tons. The products are widely used and can be supplied to users in metallurgy, chemical, hydraulic, port and marine machinery The main equipment includes a 2000-ton hydraulic press, a 3-ton electro-hydraulic hammer, a 2.5-meter ring rolling machine, and is equipped with large and small traveling machines, metalworking lathes, and multiple large and small sawing machines. The company now has more than 100 sets of production equipment from a whole set of processes from blanking, heating, forging to heat treatment and machining.
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