| Type: | Square Steel/Flat Steel/Hexagonal Steel |
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| Standard: | AISI, ASTM, DIN, JIS, GB, BS |
| Composition: | Alloys and Non-Ferrous Metals |
| Technique: | Cold Rolled |
| Shape: | Square Rectangular Hexagon |
| Surface Treatment: | Polished |
| Samples: |
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| Customization: |
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Suppliers with verified business licenses
Audited Supplier 
4130 structural steel has high strength and toughness, high hardenability, and the critical hardenability diameter in oil is 15-70mm; The thermal strength of steel is also good, and it has enough high temperature strength below 500 ºC, but its strength decreases significantly at 550 ºC; When the alloy element is at the lower limit, the welding is quite good, but when it is close to the upper limit, the weldability is medium, and it needs to be preheated to above 175 ºC before welding; The steel has good machinability and medium plasticity during cold deformation; There is the first type of temper brittleness in the range of 300~350 ºC during heat treatment; There is a tendency to form white spots.
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composition
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C
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Si
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Mn
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P
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S
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Cr
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Ni
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Cu
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Mo
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minimum value
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0.28
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0.15
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0.4
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-
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-
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0.8
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-
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-
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0.15
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Maximum value
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0.33
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0.35
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0.6
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0.035
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0.04
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1.1
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0.25
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0.35
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0.25
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Commodity
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Cold Drawing / Drawn Flat/ Square / Rectangular / Rectangle / Hexagonal / Special Shape Rods Bars
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Standard
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GB/T 3078-2019, GB/T 905-1994
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Grades
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Carbon steel
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SAE 1018 , A36, SS400, S235JR, Q235, SAE 1020, S20C , 1.0402, 20GB, CK22,
SAE 1045 ,S45C, C45, CK45, EN8 ,1.1191 |
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Alloy steel
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SAE 5120 , 20Cr, Scr 420H, 20Cr4, SAE 5140 , 40Cr,SCr440, 520M40,
SAE 4130 , 30CrMo, SCM430, SCM420, SAE 4140 , 42CrMo4, EN19, SCM440, 708A42, 708M40, SAE 4340, 40CrNiMoA,871M40 , SNCM439 |
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Specification
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Round Bar
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5mm to 100mm
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Square bar
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5*5mm to 120*120mm
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Flat bar
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5*20mm to 20*100mm
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hex bar
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5mm to 120mm
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hexagonal bar
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5mm to 120mm (side to side)
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Tolerance
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Class H11
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Length
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4-12m random length or as per request fixed length
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Surface
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Bright, or dark as per required
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Packing
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Wrapped by plastic clothes and steel strips
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Delivery Condition
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BK, BKW, GBK, NBK
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Container
Size |
20ft GP:5898mm(Length)x2352mm(Width)x2393mm(High)
40ft GP:12032mm(Length)x2352mm(Width)x2393mm(High) 40ft HC:12032mm(Length)x2352mm(Width)x2698mm(High) |
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Application
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hardware tools, auto parts, standard parts, fasteners common shaft, machinery manufacturing, light industry, hardware, bicycles,
cars, motorcycles, textile machinery, transformers and other machinery industry. |
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Advantages
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greater size accuracy, straightness and increased tensile and yield strength as well as improved machinability
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MOQ
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1 tons
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Tensile strength σ B (MPa): ≥ 930 (95)
yield strength σ s (MPa):≥785(80)
Elongation δ 5 (%):≥12
Reduction of area ψ (%):≥50
Impact energy Akv (J): ≥ 63
Impact toughness value α kv (J/cm2):≥78(8)
Hardness: ≤ 229
HB Sample size: sample blank size is 25mm
Heat treatment specification: quenching 880 ºC, water cooling, oil cooling; Temper 540 ºC, water cooling and oil cooling.
This kind of steel is usually used in the quenched and tempered state. When the carbon content is lower, it can also be used as carburized steel with higher core strength. In the medium-sized machinery manufacturing industry, it is mainly used to manufacture quenched and tempered parts with large section and working under high stress conditions, such as shafts, main shafts, and operating wheels, bolts, stud bolts, gears, etc. under high load; In the chemical industry, it is used to manufacture welded parts, welded structures composed of plates and pipes, and high-pressure conduits with a temperature not exceeding 250 ºC working in the medium containing nitrogen and hydrogen; In the steam turbine and boiler manufacturing industry, it is used to manufacture fasteners working below 450 ºC, flanges and flange covers under high pressure at 500 ºC.
Packaging |
1. by bundles, each bundle weight under 3 tons, for small outer diameter steel bars, each bundle with 4 - 8 steel strips. 2. after making by bundle, covered with Polyethylene waterproof cloth. 3. make black paints painting on each bar, then make bundles |
| 20 feet container contains dimension | Length under 6000mm |
| 40 feet container contains dimension | Length under 12000mm |
| By bulk vessel | Freight charge is low by bulk cargo, and large heavy sizes can not be loaded into containers can shipping by bulk cargo |
1. Who are we?
Our headquarter is located in Shandong, China. Since 2022, we have sold to North America (60.00%), Western Europe (14.00%) and South America (6.00%). There are about 11-50 people in our office.
2. How do we guarantee quality?
Always provide pre-production samples before mass production;
Always carry out final inspection before shipment;
3. What can you buy from us?
Copper, aluminum, die steel, titanium, customized machine parts
4. Why should you buy from us instead of other suppliers?
The company has 25 years of production experience. It has advanced precision production equipment, modern large warehouse, 200000 tons of inventory goods and a number of long-term stable cooperative customers.
5. What services can we provide?
Accepted delivery conditions: FOB, CFR, CIF, EXW
Accepted payment currency: US dollar, Euro, Japanese yen, Canadian dollar, Australian dollar, Hong Kong dollar, British pound, RMB, Swiss franc;
Accepted payment type: T/T, L/C, D/P D/A, PayPal;
Optional ports: Tianjin, Shanghai, Guangzhou;
Spoken: English, Chinese
6. How can we get your price?
A. We need the following information to quote for you:
1). Product Name
2). standard
3). Material grade (chemical composition)
4). dimension
5). amount
6). Special part drawin
Suppliers with verified business licenses
Audited Supplier 
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