Jiangyin Jiangnan Metal Co., Ltd. is an open-die forging factory in Jiangyin, Jiangsu, China. We make 41MoCr11 forged bars, shafts, hollow bars, seamless rolled rings, discs and blocks. The steel is melted by EAF + LF + VD, and forgings are delivered normalized, annealed or quenched and tempered.
41MoCr11 is a Cr-Mo alloy steel for quenching and tempering, listed in the Romanian standard STAS 791. It has 0.38–0.45 % carbon, 0.90–1.30 % chromium and 0.15–0.30 % molybdenum, and is in the same group as 42CrMo4 (1.7225) and AISI 4140. Jiangyin Jiangnan Metal Co., Ltd. forges 41MoCr11 bars, shafts, rings and discs at its factory in Jiangyin, Jiangsu, China.
With chromium and molybdenum, 41MoCr11 hardens well in thick sections, so large forgings can be quenched and tempered to high strength with good toughness. The grade is used for statically and dynamically stressed parts of vehicles, engines and machines, mainly parts with larger cross-sections such as crankshafts and gears.
Compared with parts cut from rolled bar, open-die forging breaks down the cast structure of the ingot, closes internal porosity and gives grain flow along the part. Shafts, rings and discs made this way have better fatigue strength and usually pass ultrasonic testing more easily.
| Element | Content (%) | Range, 0–1.4 % scale |
|---|---|---|
| Carbon (C) | 0.38–0.45 | |
| Silicon (Si) | 0.17–0.37 | |
| Manganese (Mn) | 0.40–0.80 | |
| Chromium (Cr) | 0.90–1.30 | |
| Molybdenum (Mo) | 0.15–0.30 | |
| Nickel (Ni) | ≤ 0.30 | |
| Copper (Cu) | ≤ 0.30 | |
| Phosphorus (P) | ≤ 0.035 | |
| Sulphur (S) | ≤ 0.035 | |
| Titanium (Ti) | ≤ 0.02 |
Solid bar: specified range. Hatched bar: maximum only. Narrower ranges, for example lower sulphur, can be melted to your specification.
41MoCr11 belongs to the 42CrMo4 / 4140 group. The closest grades in other standards are listed below. Their limits are close but not identical, so please tell us which standard you need when you send an enquiry.
All shapes below are open-die forged or ring rolled in our Jiangyin plant, and delivered rough machined or machined to drawing.
Round bars and rods, square, rectangular, flat and hex bars.
Step shafts, gear shafts, pinion shafts and spindles.
Hollow bars, sleeves, bushes, pipes, tubes, barrels, casings, shells, cylinders, hubs and housings.
Ring-rolled rings and forged rings for flanges, gears and machinery.
Forged rings for slewing bearings and large-diameter bearings.
Forged blocks, discs (disks), plates and gear blanks.
| Operation | Temperature | Cooling |
|---|---|---|
| Hot forging | 1180 → 800 °C | Slow cool after forging |
| Annealing | 700–730 °C | Furnace |
| Normalizing | 850–880 °C | Air |
| Hardening | 820–860 °C | Oil or water |
| Tempering | 540–680 °C | Air, oil or water |
Typical figures for this grade. The actual cycle depends on section size and the properties required.
Mechanical tests are done to the customer's requirement. For reference, the table gives the minimum +QT values of the equivalent grade 42CrMo4 in EN 10083-3. Strength drops as the section gets bigger, so for large forgings the ruling section should be agreed at enquiry.
| Diameter d (mm) | Yield Re min (MPa) | Tensile Rm (MPa) | Elongation A min (%) | Impact KV min (J) |
|---|---|---|---|---|
| ≤ 16 | 900 | 1100–1300 | 10 | 30 |
| 16 < d ≤ 40 | 750 | 1000–1200 | 11 | 35 |
| 40 < d ≤ 100 | 650 | 900–1100 | 12 | 35 |
| 100 < d ≤ 160 | 550 | 800–950 | 13 | 35 |
| 160 < d ≤ 250 | 500 | 750–900 | 14 | 35 |
Above 250 mm, properties are agreed with the customer and tested on samples taken from the forging.
41MoCr11 is used for statically and dynamically stressed components of vehicles, engines and machines, and in particular for parts with larger cross-sections. Typical forged parts include:
| Minimum order | 12 tonnes |
|---|---|
| Payment | 30 % advance by T/T, balance before shipment against shipping documents; or irrevocable L/C at sight |
| Technical data | Chemical composition, physical properties and mechanical tests to the customer's requirement |
| Ultrasonic test | SEP 1921-84 Class C/c or D/d (optional) |
| Marking | Grade, heat number and length stamped on each piece, colour marking as required |
For a quotation, please send grade and standard, shape and size, quantity, delivery condition and testing requirements to sales@steelforgepieces.com.
41MoCr11 is a Cr-Mo alloy steel for quenching and tempering from the Romanian standard STAS 791. It has about 0.38–0.45 % carbon, 0.90–1.30 % chromium and 0.15–0.30 % molybdenum. Typical uses are shafts, crankshafts, gears and other highly loaded machine parts with large cross-sections.
The closest equivalents are 42CrMo4 / 1.7225 (EN 10083-3), AISI/SAE 4140 (USA), SCM440 (JIS, Japan), 42CrMo (GB/T 3077, China), 42CD4 (France) and 708M40 (BS 970, UK). The limits are not exactly the same, so the standard should be written on the purchase order.
Jiangyin Jiangnan Metal Co., Ltd. makes 41MoCr11 open-die forgings at No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province 214423, China. Products include round, square, flat and hex bars, shafts, hollow bars, seamless rolled rings, slewing bearing rings, discs, blocks and gear shafts. Tel +86 189 2135 9659, email sales@steelforgepieces.com.
Forging is usually done between about 1180 °C and 800 °C. Annealing is at 700–730 °C, normalizing at 850–880 °C, hardening at 820–860 °C with oil or water quench, and tempering at 540–680 °C. Forgings can be delivered normalized, annealed or quenched and tempered.
We can do ultrasonic testing to SEP 1921-84 Class C/c or D/d on request. Other acceptance standards can be agreed when you send the enquiry.
Minimum order is 12 tonnes. Payment is 30 % advance by T/T and the balance before shipment against shipping documents, or irrevocable L/C at sight.
Welding is difficult because of the carbon and chromium content. If it has to be welded, do it in the annealed condition with preheating, followed by stress relieving or tempering.
Jiangyin Jiangnan Metal Co., Ltd. is an open-die forging factory in Zhouzhuang Town, Jiangyin City, Jiangsu Province 214423, China. We produce forged bars, shafts, hollow forgings, seamless rolled rings, discs and blocks in carbon steel, alloy steel, tool steel, stainless steel and nickel alloys, and export to customers in many countries.