20# hot rolled steel sheet

No. 20 round steel belongs to high-quality low-carbon carbon steel, cold-extruded, carburized and hardened steel.

Classification ：

Steel Round Bars

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Product Details

Product introduction

(1) Characteristics The steel belongs to high-quality low-carbon carbon steel, cold extruded, carburized and hardened steel. The steel has low strength, good toughness, plasticity and weldability. The tensile strength is 253-500MPa, and the elongation is ≥24%.
The properties of 20 are basically similar to those of 15 steel, but the strength is slightly higher. Uses: suitable for the manufacture of small and medium carburizing and carbonitriding parts that are not important for the construction of automobiles, tractors and general machinery manufacturing, such as handbrake shoes, lever shafts, gearbox speed forks, transmission passive gears and Camshafts on tractors, suspension equalizer shafts, equalizer inner and outer bushings, etc.; used to manufacture various mechanical parts that are not stressed but require high toughness under hot-rolled or normalized conditions; in heavy and medium-sized machinery manufacturing Medium, such as forged or pressed tie rods, shackles, levers, sleeves, clamps, etc. In the steam turbine and boiler manufacturing industry, it is mostly used for pipes, flanges, headers and various fasteners working in non-corrosive media with a pressure of ≤6N/square and a temperature of ≤450℃; used to make crosses on railways, locomotives and vehicles Castings such as heads and pistons.
Normalizing can promote the spheroidization of the steel, refine the massive proeutectoid ferrite, and improve the cutting performance of the blank less than 160HBS.
The process route of the steel die parts is: blanking→forging die blank→annealing→mechanical rough machining→cold extrusion molding→recrystallization annealing→mechanical finishing→carburizing→quenching, tempering→grinding and polishing→assembly.
(2) Delivery state and hardness Unheated state, hardness ≤156HBS.

Technical data

The chemical composition of standard JB/T 6057-92 steel (mass fraction, %)

C	Si	Mn	P	S	Ni	Cr	Cu
0.17~0.23	0.17~0.37	0.35~0.65	≤0.035	≤0.035	≤0.30	≤0.25	≤0.25

Mechanical properties
(5) Phase transition temperature (approximate value) Ac1=735℃, Ac3=855℃, Ar3=835℃, Ar1=680℃
(6) Normalizing specification The temperature is 920~950℃, and the furnace is air cooled. The hardness is 131~156HBS.
(7) Specification for softening treatment of cold pressed blanks The temperature is 700~720℃, the holding time is 8~15h, and the cooling rate is 50~100℃/h, and the temperature drops to 550~600℃ with the furnace, and the furnace is air cooled.
The hardness before treatment is ≤143HBS, and the hardness after softening is ≤131HBS.
(8) Quenching specification Temperature 910℃±10℃, cooling with 10% NaCl brine.
(9) Measured yield strength fy=245Mpa, elastic modulus E=206Gpa, Poisson’s ratio ν=0.3.
(10) The shear strength is 275~392MPa, the tensile strength is 253~500MPa, the yield strength is 275MPa, and the elongation is 25%.
(11) The annealing temperature is only 600-650 degrees, and the holding time is 1-2h.

Our services of our round bar :

1. If you find any quality problem after receiving the goods, you can contact with us, we will manage and reply you in 12 hours

2.We are a factory manufacturing SS Round bar,best production capability ,best quality control, Best Service .

3.Inspected by the Inspection Institution of SGS or ISO

4.100% QC inspection Before Shippment.

If you have any questiond Plesse contact us in time.

Factory profile

Adhering to the tenet of "integrity first, quality for survival", the company has established a complete marketing channel of "based in North China, radiating the whole country, and facing the world", and has not only established a solid strategic partnership with many domestic and foreign enterprises.We have been committed to product development, production and sales, after more than ten years of efforts, our products have been widely used in various fields.

Packing method: Packing according to customer's requirement.

The company has more than 110,000 square meters of production and processing base, fully introduced the international advanced modern automatic production and processing equipment, and took the lead in passing the ISO9001, TS16949, BV, SGS and other international well-known institutions certification.The products are mainly exported to Italy, Mexico, South Korea, Israel, Turkey, India, Pakistan, Kyrgyzstan, Oman, Kazakhstan, Vietnam, Myanmar and other countries. The company's supply is sufficient, the variety is complete, order production is fast, welcome domestic and foreign manufacturers, traders to contact us.

Company Advantages
1. We are a large-scale production enterprise integrating production, research and development, and can customize the products required by customers.
2. We have a perfect after-sales service system, which can track the problems encountered by customers in production at any time and provide corresponding technical support, so as to share our high-quality resources with customers.
3. After more than ten years of development, the company has complete product varieties and large inventory, which can be delivered in the shortest time.
4. Free samples are available.
5. With obvious price advantage, the company has complete production process, from raw materials to finished products integrated production can maximize the cost savings.