Cheap Price Hot Rolled Flat 1019 1022 19mn5 20mn5 21mn4 Black Mild Carbon Steel Alloy Steel Round Rod Bar

• Type: Alloy Steel
• Standard: AISI, ASTM, GB, JIS, DIN, BS
• Technique: Hot Rolled
• Application: Structural Steel Bar, Tool Steel Bar, Die Steel Bar
• Surface Treatment: Black/Peeling/Polishing/Machining/Grinding/Turning
• Alloy: Alloy
• Model NO.: 1019 1022 19Mn5 20Mn5 21Mn4
• Special Use: Mold Steel
• Transport Package: Standard Packaging or Customized
• Specification: 100-12000mm
• Trademark: meide
• Origin: Shandong, China
• HS Code: 72141000
• Production Capacity: 1000 Ton/Month

Product Description

Product Description

Low alloy high strength steel is a kind of engineering structural steel developed by adding a small amount of Mn, Si, Nb, V, Ti, Al and other alloy elements on the basis of carbon structural steel. The so-called low alloy means that the total amount of alloy elements in steel does not exceed 3%. High strength is relative to carbon engineering structural steel. The development principle of low alloy high strength steel is to use as few alloying elements as possible to obtain as high comprehensive mechanical properties as possible, so as to meet the purpose of use and low cost. Low alloy high-strength steel can meet the requirements of large bearing capacity of various structures (such as large bridges, pressure vessels, ships, etc.) in engineering, and at the same time, it is required to reduce the dead weight of structures, improve reliability, and save materials and resources. This kind of steel is mainly used to manufacture various engineering structures with high strength requirements, such as bridges, ships, vehicles, high pressure vessels, oil and gas pipelines, large steel structures, etc. Because this kind of steel can obtain high strength without complex treatment process or even heat treatment, which greatly reduces the quality of engineering structures, it is used to replace general carbon structural steel.

chemical composition

 

Grade	C	Si	Mn	Cr	Ni	Mo	P	S	Cu
20Mn2	0.17-0.24	0.17-0.37	1.40-1.80	≤0.30	≤0.30	≤0.10	≤0.030	≤0.030	≤0.30
SMn420	0.17-0.23	0.15-0.35	1.20-1.50	≤0.35	≤0.25		≤0.030	≤0.030	≤0.30
1524	0.19-0.25	0.15-0.30	1.35-1.65	-	-		≤0.040	≤0.050	≤0.20
22Mn6	0.18-0.25	0.10-0.40	1.30-1.65	≤0.40	≤0.40	≤0.10	≤0.025	≤0.035	≤0.30
18Mn5 1.0436	0.15-0.20	≤0.40	0.90-1.60	≤0.30	≤0.30	≤0.08	≤0.025	≤0.015	≤0.30
30Mn2	0.27-034	0.17-0.37	1.40-1.80	≤0.30	≤0.30	≤0.10	≤0.030	≤0.030	≤0.30
50Mn2/50Mn7/1.0913	0.47-0.55	0.17-0.37	1.4-1.8	≤0.3	≤0.3	≤0.15	≤0.035	≤0.035	≤0.15
SMn433	0.30-0.36	0.15-0.35	1.20-1.50	≤0.35	≤0.25	-	≤0.030	≤0.030	≤0.30
1330	0.28-0.33	0.15-0.35	1.60-1.90	≤0.20	≤0.25	≤0.60	≤0.035	≤0.040	≤0.35
28Mn6	0.25-0.32	0.10-0.40	1.30-1.65	≤0.40	≤0.40	≤0.10	≤0.025	≤0.035	≤0.30
1.1170	0.25-0.32	≤0.40	1.30-1.65	≤0.40	≤0.40	≤0.10	≤0.030	≤0.035	≤0.30
20Mn/1022/G10220/21Mn4/1.0470/ 20M5/CE20E4/1.1147	0.18-0.23	-	0.7-1	-	-	-	≤0.04	≤0.05	-

 

Product Parameters

Item	Hard Chromed Rod	Induction Hardened Chromed	Nickel and Chrome Plating Bars
Tolerance	ISOf7	ISOf7	ISOf7
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

Mechanical properties

 

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
40Mn2	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

FAQ

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 drawing