Flat alloy bars are available in a diverse selection of grades and finishes processed to meet your exact requirements. Whether you require full-length alloy bars or small, cut pieces, we have the product on hand and processing capabilities to turn around
| Equivalent material of 4140 flat bar | |||
| GB/T 3077-2015 | EN 10083-3:2006 | ASTM A29/A29M-2012 | JIS G 4053-2008 |
| 40CrMnMo | - | 4140、4142 | SCM440 |
Chemical properties of 4140 alloy steel flat bar | ||||
| C | Si | Mn | Cr | Mo |
| 0.37~0.45 | 0.17~0.37 | 0.90~1.20 | 0.90~1.20 | 0.20~0.30 |
| Recommended 4140 Flat Bar Heat Treatment Regime | ||||
| Sample blank size/mm | Quenching | Temper | ||
| heating temperature / ℃ | coolant | heating temperature / ℃ | coolant | |
| 25 | 850 | Oil | 600 | water, oil |
| Mechanical properties of 4140 steel flat bar | |||||
| Tensile Strength | Lower Yield Strength | Elongation After Break | Rate of Reduction in Area | Impact absorption energy | Brinell Hardness HBW |
| ≥980 | ≥785 | ≥10 | ≥45 | ≥63 | ≤217 |
| Note: Available as annealed or high temperature tempered. | |||||
4140 alloy steel flat bar is an cold drawn annealed steel of relatively high hardenability with its chromium content provides good hardness penetration, and the molybdenum imparts uniformity of hardness and high strength. 4140 alloy steel flat bar responds well to heat-treatment and is relatively easy to machine in the annealed condition. 4140 steel flat bar has good strength and wear resistance, excellent toughness, coupled with good ductility, and the ability to resist stress at elevated temperatures.
4140 flat bar is used to manufacture forgings with higher strength and larger quenched and tempered sections. Such as large gears for locomotive traction, supercharger transmission gears, rear axles, highly loaded connecting rods and spring clips. 4140 flat steel can also be used for oil deep well drill pipe joints and fishing tools below 2000m.
Product name | 4140 Alloy Steel Flat Bar |
| Types | Hot Rolled, Cold Finished |
| Thicknesses | 0.109" thru 4" |
| Widths | up to 14.625" |
| Standards | GB/T 3077-2015, ASTM A29/A29M-2012, JIS G 4053-2008 |
| Workability | Moderate to Weld, Cut and Machine. |
| Available Stock Sizes | 2ft, 4ft, 6ft, 8ft, 12ft or Cut to Size |
| MOQ | 1 ton |
| Supply Ability | 5000 tons / month |
| Lead Time | 10-15 working days after the receipt of 30% deposit |
| Payment Terms | 30%T/T Advance + 70% Balance |
| Price Terms | FOB, CFR, CIF, EXW |
| Packing | Standard sea-worthy package or as required |
| *If you do not find what you are
looking for, please call us now. If you have found it, we are happy to
answer any questions or concerns you may have about flat bar grades and assist you through the purchasing process. | |
◆ FAQ:
Q:Can you send samples?
A:Sample can be for free,freight cost collect.
Q:What product information do I need to provide?
A:Steel grade/thickness/width/quantity,these will decide the price.
Q:About product prices?
A:Prices vary from period to period due to cyclical changes in the price of raw materials.
Q:What are the certifications for your products?
A:We have ISO 9001,CE,SGS,BV and other certifications.
Q:How about the delivery time?
A:Regularly the delivery time around 10-15 days,customized one will inform the delivery time ahead.
Q:Does the product have quality inspection before loading?
A:All the products are strictly tested before packaging,also can inspect by third party inspection.
Q:How to pack the products?
A:Standard export package with waterproof film and wooden pallet.It can effectively protect products from corrosion.
