Hot Rolled Alloy Structural Steel Round Bar SCM440

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Loading Port:: China main port

Payment Terms:: TT OR LC

Min Order Qty:: 30 m.t.

Supply Capability:: 10000 m.t./month

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Product Description:

Hot Rolled Alloy Structural Steel Round Bar SCM440

Technical Paramenters


Standard	Grade	C	Cr	Mo	Si	Mn	P	S	Ni	Cu

GB	42CrMo	0.38-0.45	0.90-1.20	0.15-0.25	0.17-0.37	0.50-0.80	0.035	0.035	0.3	0.3
JIS	SCM440	0.38-0.43	0.90-1.20	0.15-0.30	0.15-0.35	0.60-0.90	0.03	0.03	0.25	0.3
ASTM	4140	0.38-0.43	0.80-1.10	0.15-0.25	0.15-0.35	0.75-1.00	0.035	0.04	—	—
ENISO	42CrMo4	0.38-0.45	0.90-1.20	0.15-0.30	≤0.40	0.60-0.90	0.035	0.035	—
ENISO		0.38-0.45	0.90-1.20	0.15-0.30	≤0.40	0.60-0.90	0.035	0.035	—

Grade	aisi4140 astm4140 sae4140 42CrMo,1.7225,scm440,42CrMo4
Processing	EAF+LF+VD
Commodity	steel round bar/round steel bar/round bar steel
Technique	hot rolled
Diameter	10-310mm
Length	canbe required to 3-12m
Sizes tolerance	length: +/-100mm,straightless:3mm/m
Application	1) General service industries (petroleum, food, chemical, paper, fertilizer, Fabric, aviation and nuclear) 2) Fluid, gas and oil transport 3) Pressure and heat transmission 4) Construction and ornament 5) Boiler heat exchangers
Advantages of this material	1) High fatigue strength and impact resistance after tempering 2) Good low-temperature impact toughness 3) No obvious temper brittleness
Quality Condition	1): Straightness: 3mm/m (max) 2): Corner Radius: 3(max) 3): The ends will be end cut or gas cut 4): No cracks on the surface
Packing	1): Paint oil on the surface to protect steel bars from rusting. 2): Bundle packing by Iron Strips. 3): Bundle weight is from 2mt to 3 mt. 4): Two or three tags will be attached on each bundle.
MOQ	5 tons for each sizes

Products Show

Product Overviews

Product Name	Typical Grades	Diameter(mm)	Standard adopted
Carbon Steel	20 (1020/S20C/C22)	Ø16-Ø300	GB/SAE/JIS/DIN
	40 (1040/S40C/C40)
	45 (1045/S45C/C45)
Bearing Steel	GCr9 (51100/SUJ1)	Ø12-Ø250
	GCr15 (52100/SUJ2/100Gr6)
	GCr9SiMn (A485-Gr.1/SUJ3)
Cr-Mo Steel	20Cr (5120/SCr420H/20Cr4)	Ø12-Ø250
	40Cr (5140/SCr440/41Cr4)
	42CrMo(4140/SCM440/42CrMo4)
Gear Steel	20CrNiMo	Ø16-Ø600
	20CrMn(5115/SMnC420/20MnCr5)
	20CrNiMo(8620/SNCM220/20CrMiMo2)

Application

Carbon Steel	Mold bottom, Plastic mold, Construction machinery parts Automobile parts, Security grills, Screens, Construction
Bearing Steel	Aerospace, Navigation, Nuclear energy, Chemical industry Electronic information, Petrochemical, Instrument and meter Transportation
Cr-Mo Steel	Mechanism & Fasteners gear, Stressed components for vehicles Engines and machines, Parts of larger cross-section
Gear Steel	All kinds of gears, Statically and dynamically stressed component for vehicles Engines and machine, Larger cross-section parts, Crankshafts

Work Shop

Hot Rolled Alloy Structural Steel Round Bar SCM440

Company Information

CNBM International Corporation is the most important trading platform of CNBM group.

Whith its advantages, CNBM International are mainly concentrate on Cement, Glass, Iron and Steel, Ceramics industries and devotes herself for supplying high qulity series of refractories as well as technical consultancies and logistics solutions.

FAQ

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?

CNBM is 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?

CNBM provides 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.

Packaging & Delivery

1, Packaging: seaworthy package or as required

2, Delivery: 35-45 days or based on quantity

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Q:The 8 thread can replace the beam stirrups by steel: Fixed beam and beam is set in the stirrups stirrups, stirrup stirrup is higher than that of the non quota subheadings subheadings, because all trouble making and binding stirrups. In addition, need to see which parts of the ring beam.

Q:What is the difference between strip steel and round steel? Where are they mainly used?: Difference between round bar and other steel bars:(1), is not the same, round shape light round, no pattern without ribs, other steel surface appearance is engraved or ribbed, cohesive force that cause steel and concrete, and the bond strength of steel and concrete in the other.(2) the composition is different. Round steel (grade a steel) belongs to ordinary low carbon steel, and most other steel bars are alloy steel.(3), the strength is not the same, low strength steel, and other steel with high strength, the diameter of the same size as compared with other steel, round steel can bear the pulling force than other reinforced small, but the plastic steel reinforced bar is stronger than the other, there is a large deformation in the break before, while the other bars in the break before the deformation is much smaller.

Q:12mm Round steel, the material is Q235, the maximum weight can bear?: Standard Specification for hot rolled round steel is 5.5-250 mm. Among them, 5.5-25 mm small round bars are mostly supplied by straight strips. They are used as reinforcing bars, bolts and various mechanical parts. They are more than 25 millimeters of round steel. They are mainly used in the manufacture of mechanical parts or seamless steel tube billets.

Q:Can steel bars be replaced by large screws in the concrete floor?: Tensile strength, extensibility, yield point! The same thread can be used instead!Of course, the number of roots must also be the same ~ only specifications vary!

Q:How can I connect channel steel and round steel?: Can first welding a large circular steel plate and steel bar etc. in the channel to the end faces of the circular plate thickness should be more than 10mm, then the circular plate side angle steel and round steel bar to coincide welding, chamfering, need full welding between the two.

Q:What are the differences between the products made of wrought round steel and hot rolled round steel and tested by mechanical testing after heat treatment?: Hot rolled round steel products made in forging round steel, this is because of forged steel ingot is as equivalent to the blooming state of the existing semi finished steel. Its structure, properties and impurity content are far below the quality level of hot rolled round steel.

Q:Special steel bar steel products used to do what: Carbon tool steel is high carbon steel basically contains alloy elements, the carbon content in the range of 0.65% ~ 1.35%, the production of low cost, easy to obtain raw materials, good machinability, after treatment can obtain high hardness and high wear resistance, so it is widely used in steel, used to manufacture all kinds of cutting tools, mold, measuring.

Q:How about tempering No. 45 round bar?: During quenching and tempering, the whole section of the workpiece is quenched and the microstructure of the workpiece is obtained with fine acicular quenched martensite. By tempering at high temperature, the microstructure with uniform tempered bainite is obtained. It is impossible for a small factory to do metallographic analysis of each furnace. It is generally used only for hardness testing. That is to say, the hardness of the quenched material must be reached by the quenching hardness of the material, and the hardness after tempering shall be checked according to the requirements of the drawing.

Q:Can the same grade steel instead of round bar be ok?: The above analysis, threaded steel than round steel performance is good, in general circumstances can be replaced.

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.

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