Hot Rolled & Ground 4140 Alloy Steel Round Bar for Precision Hardware Manufacturing
This 4140 alloy steel round bar combines the structural integrity of hot rolling with the precision of ground surface treatment, tailored specifically for high-demand hardware applications. The hot-rolled base ensures a dense, uniform internal structure with excellent mechanical strength, while the precision ground finish delivers ultra-tight diameter tolerances, a smooth surface and minimal machining allowance—ideal for producing high-precision hardware parts.
As a classic medium-carbon alloy steel, 4140 offers outstanding tensile strength, wear resistance and hardenability, with superior performance after heat treatment. It excels in withstanding repeated loads and friction, making it the preferred material for heavy-duty hardware components.
Widely used in manufacturing fasteners, hinges, precision shafts, hand tools, locks and hardware accessories. Strict quality control ensures consistent chemical composition and dimensional accuracy, providing a reliable foundation for high-quality hardware production across industrial and commercial sectors.
| Products |
round bar |
| Material |
SS400 S45C S20C |
| Standard |
ASTM A240,GB/T3280-2007,JIS4304-2005,ASTM A167 |
| Length |
3-12m |
| Size |
8-400mm |
| Application |
ships building industry,petroleum,chemical industries, war and electricity industries, food processing and medical industry, boiler heat exchanger, machinery and hardware fields. |
| Payment Terms |
L/C , T/T or Western Union |
ABOUT US
We specialsied in kinds of steel products more many years,especially in hot rolled steel round bars ,square bars,flat bars ,cold drawn bars and forged bars.
Our main material are all carbon steel and alloy steel ,such as :aisi1020 1035 1045 1055 s20c s35c s45c s55c ss400 a36 c20 c35 c45 ck45 aisi4140/scm440 aisi4340/40crnimoa aisi8620H,40cr,gcr15,sae52100,20Mn,40Mn,St52,St37,S235JR,etc
1. Grade:
45# 45B S45C C45 CK45 Cm45 AISI1045 SAE1045 ASTM1045 XC45 1.0503 0.1191 1.1201
2. Specification:
Dia: 20-300mm, Length:2000-13000mm or as required
3. Process:
Hot rolled, black surface
4. MOQ:
20mt.
5.. Chemical composition:
| Grade |
C |
Si |
Mn |
P |
S |
B |
| 45# |
0.42
0.50
|
0.17
0.37
|
0.50
0.80
|
Max
0.035
|
Max
0.035
|
|
| 45B |
0.42
0.49
|
0.17
0.37
|
0.60
0.90
|
Max
0.035
|
Max
0.035
|
0.0005
0.0035
|
| S45C |
0.42
0.48
|
0.15
0.35
|
0.60
0.90
|
Max
0.030
|
Max
0.035
|
|
| 1045 |
0.43
0.50
|
0.15
0.35
|
0.60
0.90
|
Max
0.030
|
Max
0.050
|
|
6.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
7. Standard:
According to national standard (GB)for our products, if not, supply according to national standards(GB) or agreement.
|
Standards
|
ASTM / ASME,GB,DIN, JIS,T14975, etc
|
|
Steel Grade
|
200, 201B , 201H ,301, 303, TP304, TP304L/304L, 321 ,TP321, 316, TP316L, 316L, 316Ti,
|
|
Out Diameter
|
6mm to 2000mm or customized
|
|
Wall Thickness
|
0.5-220mm
|
|
Length
|
5.8m ,6m,or customized
|
|
Tolerance
|
Out diameter : +/-0.15mm ,Thickness: +/-11% of wall thicknessLength: +/-4.5mm - 0mm
|
|
Surface
|
Mirror Polish,Satin Polish,Without Polish,NO.1,NO.4
|
|
MOQ
|
1 ton
|
|
Supply ability
|
3000 tons per month
|
|
Packing
|
3, bundles to be covered by polythene & strapped securely
|
|
Payment terms
|
T/T or L/C,TT 30% in advance ,70% balance after received B/L copy
|
|
Delivery terms
|
FOB CFR CIF EX Works DDU
|
|
Delivery time
|
Within 5-20 days after received the deposit or as client's requirements
|
Delivery&packing
Packaging: In wooded cases , pallets or according to clients' requirements
Shipping: Tianjin port, Shanghai port and the other main ports in China
Our service
FAQ
Q:Are you trading company or manufacturer ?
A: We are factory.
Q: How long is your delivery time?
A: Generally it is 5-10 days if the goods are in stock. or it is 15-20 days if the goods are not in stock, it is according to quantity.
Q: Do you provide samples ? is it free or extra ?
A: Yes, we could offer the sample for free charge but do not pay the cost of freight.
Q: What is your terms of payment ?
A: Payment<=1000USD, 100% in advance. Payment>=1000USD, 50% T/T in advance ,balance before shippment.
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