| Type: | Round |
|---|---|
| Standard: | AISI, ASTM, DIN, JIS, GB, BS |
| Composition: | Alloy Steel |
| Technique: | Hot Rolled |
| Shape: | Bar |
| Surface Treatment: | Bright, Chrome Plated |
| Samples: |
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| Customization: |
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The bright round steel bar is a round steel with a bright surface and no rolling defects and decarburization layer on the surface. It can be subdivided into peeled, polished, and polished materials. Silver bright steel is used as machine structural steel for various specialized purposes, such as for bolts with strong wear. In addition, such as spindles, piston rods, spokes, and similar components can be used as tool steel in the quenched state.
| Material | component | C | Si | Mn | P | S | Cr | Ni | Cu |
| ASTM 1320 GB 20Mn2 | minimum value | 0.17 | 0.17 | 1.4 | - | - | - | - | - |
| maximum value | 0.24 | 0.37 | 1.8 | 0.035 | 0.035 | 0.3 | 0.3 | 0.3 | |
| ASTM 1330 GB 30Mn2 | minimum value | 0.27 | 0.17 | 1.4 | - | - | - | - | - |
| maximum value | 0.34 | 0.37 | 1.8 | 0.035 | 0.035 | 0.3 | 0.3 | 0.3 | |
| ASTM 1335 GB 35Mn2 | minimum value | 0.32 | 0.17 | 1.4 | - | - | - | - | - |
| maximum value | 0.39 | 0.37 | 1.8 | 0.035 | 0.035 | 0.3 | 0.3 | 0.3 | |
| ASTM 1340 GB 40Mn2 | minimum value | 0.37 | 0.17 | 1.4 | - | - | - | - | - |
| maximum value | 0.44 | 0.37 | 1.8 | 0.035 | 0.035 | 0.3 | 0.3 | 0.3 | |
| ASTM 1345 GB 45Mn2 | minimum value | 0.42 | 0.17 | 1.4 | - | - | - | - | - |
| maximum value | 0.49 | 0.37 | 1.8 | 0.035 | 0.035 | 0.3 | 0.3 | 0.3 | |
| GB 50Mn2 DIN 50Mn7 | minimum value | 0.47 | 0.17 | 1.4 | - | - | - | - | - |
| maximum value | 0.55 | 0.37 | 1.8 | 0.035 | 0.035 | 0.3 | 0.3 | 0.3 |
| Item | Hard Chromed Rod | Induction Hardened Chromed | Nickel and Chrome Plating Bars |
| Roundness | Diameter tolerance / 2 | diameter tolerance / 2 | diameter tolerance / 2 |
| Standard Length | -for Ø ≤ 60 mm: 5600 -6200mm -for Ø≥60 mm: 5800 -7200mm Upon request: special lengths on all diameters |
- for Ø ≤ 60 mm: 5600 - 6200 mm - for Ø ≥ 60 mm: 5800 - 7200mm Upon request: special lengths on all diameters |
Up to 6000 mm Upon request: special lengths on all diameters |
| Surface Roughness | Ra max. 0.20 µm (statistic average: 0.05-0.15 µm) |
Ra max. 0.20 µm (statistic average: 0.05- 0.15 µm) |
Ra max. 0.20 µm (statistic average: 0.05-0.15 µm) |
| Chrome Layer Thickness | min. 900 HV (0.1) |
min. 900 HV (0.1) | min. 25 µm |
| Straightness | ≤ Ø16 mm: max. 0.3 mm: 1000 mm > Ø16 mm: max. 0.2 mm: 1000 mm |
≤ Ø16 mm: max. 0.3 mm: 1000 mm > Ø16 mm: max. 0.2 mm: 1000 mm |
max.0.20 mm/1000 mm |
|
GB
|
ISC
|
JIS
|
ASTM/AISI
|
UNS
|
ISO
|
DIN EN/DIN
|
W-Nr.
|
NF EN/NF
|
W-Nr.
|
|
35CrMo
35CrMoV |
A30352
A31352 |
SCM435
SCM435H
|
4135
|
G41350
|
34CrMo4
|
34CrMo4
|
1.7220
|
35CD4
|
1
|
| Material | Diameter (thickness) d mm |
tensile strength σ b Mpa |
Yield point σ s Mpa |
Elongation or elongation after fracture δ % |
Hardness HBW |
Impact absorbed energy KV2 J |
| ASTM 1320 GB 20Mn2 | d=15 | ≥785 | ≥590 | ≥10 | ≤187 | ≥47 |
| ASTM 1330 GB 30Mn2 | d=25 | ≥785 | ≥635 | ≥12 | ≤207 | ≥63 |
| ASTM 1335 GB 35Mn2 | d=25 | ≥835 | ≥685 | ≥12 | ≤207 | ≥55 |
| ASTM 1340 GB 40Mn2 | d=25 | ≥885 | ≥735 | ≥12 | ≤217 | ≥55 |
| ASTM 1345 GB 45Mn2 | d=25 | ≥885 | ≥735 | ≥10 | ≤217 |
≥47 |
| GB 50Mn2 DIN 50Mn7 | d=25 | ≥930 | ≥785 | ≥9 | ≤229 | ≥39 |
| Brand | Main characteristics |
| 20Mn2 | The properties of 20Mn2 and 20Cr with medium strength and small section size are similar, and the low-temperature impact toughness and weldability are better than those of 20Ct. High plasticity during cold deformation, good machinability, higher hardenability than corresponding carbon steel, overheating, decarburization sensitivity and temper brittleness during heat treatment |
| 30Mn2 | 30Mn2 is usually used after quenching and tempering treatment. It has high strength, good toughness, and excellent wear resistance. When manufacturing parts with small section size, it has good static strength and fatigue strength, good wire drawing, cold heading, and heat treatment process, medium machinability, and acceptable weldability. Generally, it does not make weldments. When welding is required, the parts should be preheated to above 200 ° C, with high hardenability, and small quenching deformation, However, it has overheating, decarburization sensitivity and temper brittleness |
| 35Mn2 | The carbon content is higher than that of 30Mn2, so it has higher strength and better wear resistance. The hardenability is also improved, but the plasticity is slightly decreased. During cold deformation, the plasticity is medium, the machinability is medium, the weldability is low, and there is white spot sensitivity, overheating tendency and temper brittleness tendency. Water cooling is easy to produce cracks, and it is generally used in quenched and tempered or normalized conditions |
| V1 | Medium carbon quenched and tempered manganese steel is superior to 40 steel in strength, plasticity and wear resistance. It has good heat treatment process and machinability, and poor weldability. When the carbon content is below *, it needs to be preheated to 100-425 ºC before welding. It has temper brittleness, overheating sensitivity, and water cooling is easy to produce cracks. It is usually used in quenched and tempered state |
| 45Mn2 | Medium carbon quenched and tempered steel has high strength, wear resistance and hardenability. After quenched and tempered, it can obtain good comprehensive mechanical properties. It is suitable for oil cooling and high-temperature tempering. It is often used in the quenched and tempered state, and can also be used in the normalized state if necessary. Its machinability is acceptable, but its weldability is poor, its plasticity is low during cold deformation, its heat treatment has a tendency of over-heat sensitivity and temper brittleness, and water cooling is easy to produce cracks |
| 50Mn2 | Medium carbon quenched and tempered high strength manganese steel has high strength, high elasticity, excellent wear resistance, high hardenability, good machinability, low cold deformation plasticity, poor welding performance, overheating sensitivity, white spot sensitivity and temper brittleness, and water cooling is easy to produce cracks. Proper quenching and tempering treatment can obtain good comprehensive mechanical properties, which can be used after quenching and tempering, and can also be used after normalizing and tempering |
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
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