En
English Chinese
Products
We have professional sales team numbered 36 with more than 10 years experience.
Position:
Home > Products > Steel Profile > Steel Round Bars
20# hot rolled steel sheet
20# hot rolled steel sheet
20# hot rolled steel sheet
20# hot rolled steel sheet

20# hot rolled steel sheet

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

Related Products
W6Mo5Cr4V2Co5(M35)  hot rolled steel round bars
W18Cr4V hot rolled steel round bars
20CrNiMo(8620H) hot rolled steel round bars
34CrNiMo6 hot rolled steel round bars
Q390B-Q390D hot rolled steel round bars
CrWMn hot rolled steel round bars
3Cr2W8V hot rolled steel round bars
Cr12MoV hot rolled steel round bars
Cr12  hot rolled steel round bars
A105 hot rolled steel round bars
40CrMnMo Steel Round Bar
65Mn hot rolled steel round bars
16MnCr5 hot rolled steel round bars
B2 hot rolled steel round bars
38CrMoAl hot rolled steel round bars
18CrNiMo7-6
20MnCr5 hot rolled steel round bars
9SiCr hot rolled steel round bars
42CrMo hot rolled steel sheet
20CrMnMo
60Si2Mn hot rolled steel round bars
GCr15 hot rolled steel round bars
27SiMn hot rolled steel round bars
30CrMnTi hot rolled steel round bars
20CrMnTi(H) hot rolled steel round bars
W6Mo5Cr4V2(M2) hot rolled steel round bars
50Mn-60Mn hot rolled steel round bars
CM690 hot rolled steel round bars
40Cr hot rolled steel round bars
15CrMo hot rolled steel sheet
Inquiry
* Name
* E-mail
Phone
Country
Message