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AISI SAE4140 Alloy Structural Steel Round Bar SCM440
1 Standards and Chemical Composition:
2 Mechanical Property:
Strength of extension
3 Brief Introduction:
2-13m or as per your request
Normalizing, Annealing, Quenching
Standard seaworthy packing or according to your requirements
1, Your advantages?
professional products inquiry, products knowledge train (for agents), smooth goods delivery, excellent customer solution proposale
2, Test & Certificate?
SGS test is available, customer inspection before shipping is welcome, third party inspection is no problem
3, Factory or Trading Company?
We are a trading company but we have so many protocol factories and CNBM works as a trading department of these factories. Also CNBM is the holding company of many factories.
4, Payment Terms?
30% TT as deposit and 70% before delivery.
Irrevocable L/C at sight.
5, Trading Terms?
EXW, FOB, CIF, FFR, CNF
6, After-sale Service?
We provide the services and support you need for every step of our cooperation. We're the business partner you can trust.
For any problem, please kindly contact us at any your convenient time.
We'll reply you in our first priority within 24 hours.
- Q:How about the difference between round steel and shaped steel? Where are they mainly used?
- Section steel is a general term, round steel is a kind of section steel, mainly used in building structure, mostly for engineering steel.
- Q:What's the difference between Q345 round steel and No. 45 round steel material?
- Q345: it is a kind of manganese steel (16Mn), yielding strength of 345, good welding performance, commonly used in structural parts welding, low carbon steel, can not be used for quenching or quenching and tempering.No. 45 Steel: high quality carbon structural steel, medium carbon steel. Can be used for quenching or tempering.
- Q:How to distinguish between cold plating and hot rolled round steel?
- The difference between galvanized products: hot galvanized surface is not cold galvanized, delicate and bright, but the thickness of zinc coating, hot galvanizing is cold galvanized dozens of times. Corrosion resistance is also tens of times zinc plating.
- Q:Is there any technique for welding round steel?
- Welding skills:2.1, to determine the best welding position, the group of good welding flat, easy to rotate welding, the weld pool is always in flat position, note the rod angle at 70 degrees.2.2, the welding workpiece in continuous continuous rotation, to control the size of the weld pool at the end of each lap weld slag, cleaned, and then welding together, the thickness of each layer is about 2mm, until the full fill slope has so far.
- Q:Q235 and mechanical properties of hot rolled steel cold drawn steel have what difference, Q235 hot rolled steel with 12 combined shearing machine has a number of very hard, the damage of the blades, why
- The difference between hot rolled steel and cold rolled steelHot rolled steel contains slightly higher carbon content than cold rolled steel. The density is the same in cases where the composition is not constant. But if the composition is different, such as stainless steel, whether cold-rolled or hot rolled steel, the density is about 7.9g/cm3. Specific depends on the ingredients, hot-rolled steel plate is only better ductility, steel is also under pressure.Hot-rolled steel is divided into structural steel, low carbon steel, welding bottle steel, and then according to various kinds of steel to find the steel that you need, check the density and composition of the specific steel.Hot rolled steel is low in hardness, easy to process and good in ductility.
- Q:Why is a steel rope made of many wires rather than a round bar of steel?
- The multi ply, in order to increase the cross-sectional area increases the tension will not suddenly broken, fine wire bend more easily, so the bending of wick core can be better, with better lubrication of steel wire rope. If it is a steel bar, it is not easy to bend, it is easy to break suddenly, and the practicability is poor.
- Q:12 of the diameter of the round steel can be M12 out of the thread is not
- No problem。 M12 coarse thread of the pitch is 1.75, the outer circle to be processed to 11.8mm, the thread of the most beautiful shape. If the outer circle is too large, the tip of the tooth is too small and very easy to deform.
- Q:Do you need paint for roof lightning proof steel bars?
- The roof of the round steel as long as the welded joints painted anti rust paint is good, should not be painted a large area. When the flash device is made of steel material, hot-dip galvanized steel shall be used and corrosion resistant by zinc plating.
- Q:How can stainless steel rounds occur? Is it a quality problem?
- Cracks caused by surface folding, cracks and steel surface of 15 degrees to 75 degrees angle, about 1.5 ~ 3.5mm, tail vortex shape, slightly decarburization on both sides, decarburization layer 0.15 ~ 0.25mm, crack in the presence of oxide scales. Its macro shape is in the surface of the round steel along the rolling direction into a straight line or zigzag, continuous or intermittent appear in the partial or full length of steel. This shows that this is a folding process in the process of rolling steel. Main reasons of folding is finished before the workpiece with a handleonapot; secondly, in the process of rolling each pass from the handle, flash, serious scratch, damage, and roll ring groove wear etc., can make the product surface folding; in addition, such as the serious defect of blank, if cleaning may also be caused by improper finished folding. Therefore, the main measures to reduce or avoid folding appear: pass through reasonable design, accurate estimation of the spread, precisely adjust the position of roller groove, reduce or eliminate the finished product before rolling the handle, flash, scratches and other defects; the serious defects of the blank surface carefully cleaned.
- Q:How many grades of steel are round steel?
- Secondly, the round steel only shows the shape of steel, all kinds of steel have round steel, it can not explain the nature and composition of steel.
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