Product Description
structural carbon steel :45# with details in under sheet :
| Standard No. |
Alloy No. |
Chemical compositions(%) |
| C |
Cr |
Mn |
Ni |
P |
S |
Si |
| GB/T699-1999 |
45# |
0.42~0.50 |
≤0.25 |
0.50~0.80 |
≤0.25 |
≤0.035 |
≤0.035 |
0.17~0.37 |
Mechanical
Property |
Tensile Strength(Mpa) |
Yeild Strength(Mpa) |
Elongation(%) |
Contraction of area Z(%) |
| ≥600 |
≥355 |
≥16 |
≥40 |
The correlation between properties and parameters-S45C (JIS)-SAE1045(Aisi)-SM45 of No. 45 steel(45 steel) was studied:
No. 45 steel is a carbon structural steel with 0.45% carboncontent. It is characterized by low price, good cutting performance, high hardness after quenching, good strength, toughness and wear resistance after quenching and temperingtreatment, is widely used in manufacturing structural partsand low-grade plastic mold. "45 steel" is a popular name, thesymbol is generally recorded as"45 #". In fact GB standardsteel number is"45", it is not a sequential number, read as"45steel" is not very accurate. Ingredient code 45 steels of similar designation are S45C (JIS) and 1045(Aisi) . In addition, ourcountry metallurgical technology standard has SM45 brandnumber to express the plastic mold use specially. Comparedwith 45 steel, SM45 has lower phosphorus and sulfur contentand better steel purity.
| Standards |
YB/T 094 |
AISI |
JIS G4051 |
| Alloy No. |
SM45 |
1045 |
S45C |
| C |
0.42-0.48 |
0.43-0.50 |
0.42-0.48 |
| Si |
0.17-0.37 |
|
0.15-0.35 |
| Mn |
0.50-0.80 |
0.60-0.90 |
0.60-0.90 |
| P |
<0.030 |
<0.030 |
<0.030 |
| S |
<0.035 |
<0.035 |
<0.035 |
Recommended process specification for heat treatment andhardness: quenching temperature 820 - 860" C, water-oroil-cooled, hardness 250 HRC. Recommended tempering pro-cess specifcation: tempering temperature is 500 - 560" C, aircooling, hardness is 25 - 33HRC. Tempering in this temperature range is the tempering treatment, Quenching and tempering make the strength, plasticity and toughness of 45 steelget a good balance, the comprehensive performance is good,can adapt to the alternating load environment. After quench-ing and tempering, the surface hardness of 45 steel is low anddoes not wear well. So commonly used quenching and tempering + surface quenching to improve the surface hardnessof parts.
| Tempering temperature |
After quenching |
Unit centigrade |
| 200 |
300 |
400 |
500 |
550 |
600 |
Hardness
HRC |
57 |
55 |
50 |
41 |
33 |
26 |
22 |
| Mechanical properties (GB/T 699-1999) |
| Sample size |
mm |
25 |
| Heat treatments recommended |
Normalizing |
ºC |
850 |
| Quenching |
ºC |
840 |
| Tempering |
ºC |
600 |
| Mechanical properties |
Tensile strongth |
Mpa |
≥600 |
| Strong yield |
Mpa |
≥355 |
| Elongation |
Mpa |
≥16 |
| Section shrinkago |
Mpa |
≥40 |
| Impact |
Mpa |
≥39 |
| Hardness of delivery |
|
HB |
≤229 |
| |
HB |
≤197 |
Company Profile
Jiangsu Changli Equipment Manufacturing Co, Ltd., located in Jiangyin City, Jiangsu Province, is a steel forging manufacturing enterprise specializing in the production of forged round steel, square steel, shaft forgings, ring forgings, cylinder forgings, and forging processing, heat treatment, mechanical processing, and finished parts processing. 0.75 tons to 30 tons of ingot steel can also be supplied. The company has a strong special steel supply channel as support, especially in the special steel forgings more resource advantages, products include "chromium-nick- el-molybdenum steel, bonded steel, carbon steel, stainless steel, spring steel, bearing steel, rolls and other series."Our company can also ensure flaw detection at all levels according to customer requirements and provide quality certification documents.
Forging Equipment
The main equipment is 2000 tons of hydraulic press, ring rolling machine, 3 tons of forging hammer, 2 tons of forging hammer, 1 ton forging hammer, 750KG forging hammer, 30T heat treatment and temper- ing furnace, lathe, sawing machine and other more than 30 sets of equipment, which can produce
forgings weighing 20Kg-20000Kg. Products are not only widely used in domestic large locomotives, coal machines, petroleum machinery, shipbuilding and other industries, but also exported to Europe, South- east Asia, and other countries and regions, forging products using advanced production technology
"high-power electric furnace (EF)furnace external refining (LF) vacuum degassing (VD) fast forging annealing (or normalizing) turning, Ensure chemical composition and mechanical property require-ments.
FAQ
-
What is the difference between forging and casting?
Forging: It is the process of transforming a solid from one shape to another. Casting: It is the process of transforming a shapeless liquid metal into a solid with a shape. The so-called casting is the process of casting molten metal into a model to obtain a casting. The casting profession focuses on the metal melting process and the control of processes during the casting process. Forging is a plastic forming process in the solid state, which can be divided into hot processing and cold processing. Forgings include extrusion, drawing, roughening, punching, and so on. Casting is a solid liquid solid process, while forging is a solid to solid process where a solid can change its shape into another shape at high temperatures. There are still differences in the shape process and process of the two.
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How to choose high-quality forgings?
In the quality inspection of forgings, there are mainly external observation methods and internal inspection methods. The appearance method, as the name suggests, is to observe the appearance of the product, such as the shape, geometric dimensions, surface condition, etc. of the forging, in order to understand whether it meets the standards and whether there are external defects. Specifically, it is to check whether the external dimensions of the forging meet the specifications and whether there are defects on the surface, such as cracks, wrinkles, bubbles, indentations, pits, impurities, scratches, etc. on the surface of the forging. Internal testing mainly involves analyzing the chemical composition, macroscopic and microscopic structures, and mechanical properties of forgings. This inspection process requires the use of specialized instruments for high magnification inspection, with the aim of checking for any phenomena such as fractures and shrinkage within the forging, as well as defects such as dendrites and white spots, disordered flow lines, and throughflow. It also includes the tensile strength, ductility, hardness, plasticity, and heat resistance temperature of the forging.
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What are the characteristics of the forging process for blank forgings?
The forging process of circular forgings mainly consists of the following processes: pier roughening, elongation, punching, and expanding. The difference between free forging and ring rolling processes is mainly in the process of expanding holes. In the production of ring forgings, free forging is usually used to expand the hole with a horse screw, while ring rolling is mainly used to expand the hole with rolling.
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