S20C / S35C / S45C Round Bar

Manufacturer, Supplier & Exporter of S20C / S35C / S45C Round Bar

S20C, S35C, and S45C Round Bars are widely recognized medium and low-carbon steel grades under the Japanese Industrial Standard (JIS G4051). These grades are known for their excellent machinability, balanced strength, and suitability for heat treatment applications. Their combination of mechanical performance and cost-effectiveness makes them essential in various engineering, automotive, and industrial sectors. Riddhi Siddhi Impex serves as a leading manufacturer, stockist, and domestic supplier of S20C, S35C, and S45C round bars to multiple industries across India..

S20C Round Bar is a low-carbon steel grade offering good ductility, moderate strength, and superior machinability. It is mainly used in components where hardness is not the primary requirement, such as fasteners, bushings, nuts, bolts, and machine parts. The grade is easily weldable and suitable for carburizing applications, allowing an optimum balance between core toughness and surface hardness..

S35C Round Bar represents a medium-carbon steel with higher strength compared to S20C. It is preferred for components requiring improved toughness and wear resistance. Common applications include shafts, cam followers, connecting rods, gear parts, and automotive components. S35C provides an excellent surface finish during machining and responds well to heat treatment processes such as hardening and tempering...

S45C Round Bar is the most widely used medium-carbon steel grade among the three. It offers high tensile strength, good wear resistance, and excellent durability after heat treatment. S45C is suitable for high-load applications such as axles, crankshafts, gears, studs, hydraulic shafts, and mechanical engineering tools. Its ability to achieve high hardness after quenching makes it a preferred grade in precision engineering...

Riddhi Siddhi Impex manufactures and supplies S20C, S35C, and S45C Round Bars using premium-quality raw materials and advanced production technology. Each bar undergoes strict quality checks to ensure excellent dimensional accuracy, strength, surface finish, and compliance with global standards. The company provides these round bars in various finishes, including black, bright, peeled, ground, and polished forms..

S20C / S35C / S45C Round Bar – Specification

Product Name	S20C / S35C / S45C Round Bar
Manufacturer & Supplier	Riddhi Siddhi Impex
Standard	JIS G4051 Carbon Steel
Type	Carbon Steel Round Bars
Forms Available	Black Bars, Bright Bars, Peeled, Polished, Centreless Ground
Size Range	10 mm – 500 mm Diameter
Length	1 Meter – 6 Meter (Custom lengths available)
Condition	Annealed, Hardened, Tempered, Normalized, QT
Applications	Automotive Parts, Shafts, Gears, Axles, Machinery Components

Chemical Composition

Grade	C (%)	Mn (%)	P (%)	S (%)	Si (%)
S20C	0.18 – 0.23	0.30 – 0.60	≤ 0.040	≤ 0.040	0.15 – 0.35
S35C	0.32 – 0.38	0.60 – 0.90	≤ 0.040	≤ 0.040	0.15 – 0.35
S45C	0.42 – 0.48	0.60 – 0.90	≤ 0.040	≤ 0.040	0.15 – 0.35

Mechanical Properties

Grade	Tensile Strength (MPa)	Yield Strength (MPa)	Elongation (%)	Hardness (HB)
S20C	410 – 540	245 – 290	30%	120 – 160
S35C	540 – 650	300 – 360	25%	160 – 190
S45C	570 – 700	305 – 390	22%	170 – 210

Dimension Chart (Round Bars)

Diameter (mm)	Diameter (Inches)	Standard Length
10 – 20	3/8” – 3/4”	3–6 Meters
21 – 50	7/8” – 2”	3–6 Meters
51 – 100	2” – 4”	3–6 Meters
101 – 250	4” – 10”	3–6 Meters
251 – 500	10” – 20”	Custom

Equivalent Grades

Standard	S20C	S35C	S45C
EN	C22	C35	C45
DIN	C22E	C35E	C45E
ISO	20C	35C	45C
AISI/SAE	1022	1035	1045

Equivalent Standards

Standard	Description
JIS G4051	Carbon Steels for Machine Structural Use
EN 10083	Steels for Quenching and Tempering
AISI/SAE	American Carbon Steel Standards
DIN	German Carbon Steel Standard

Other Types of Carbon Steel Round Bars

Type	Description
C22 Round Bar	Low carbon steel for general engineering
C35 Round Bar	Medium carbon steel with improved strength
C45 Round Bar	High strength & widely used engineering steel
EN8 Round Bar	Medium carbon steel with high tensile strength
EN9 Round Bar	Higher carbon steel for robust applications

As a leading domestic supplier in India, Riddhi Siddhi Impex supplies S20C, S35C, and S45C Round Bars to major industrial hubs such as Mumbai, Delhi, Bengaluru (Bangalore), Hyderabad, Chennai, Kolkata, Pune, Ahmedabad, Surat, Vadodara, Rajkot, Nagpur, Indore, Bhopal, Jaipur, Kanpur, Lucknow, Agra, Varanasi, Amritsar, Chandigarh, Mysuru, Udaipur, Jodhpur, Visakhapatnam, Coimbatore, Madurai, Kochi, Thiruvananthapuram, Mangalore, Nashik, Kolhapur, Chandrapur, Akola, Vilayat, Somnath, Dahej, Narmada, Ankleshwar, Navsari, Valsad, and Rajpipla. The company’s robust supply chain ensures timely delivery to manufacturing, automotive, fabrication, and engineering units across the nation.

Frequently Asked Questions (FAQs)

Q1: What are the common applications of S20C / S35C / S45C Round Bars?

A1: These round bars are used in shafts, gears, axles, fasteners, connecting rods, machine parts, automotive components, and general engineering applications.

Q2: Can you provide custom diameters and lengths?

A2: Yes, Riddhi Siddhi Impex offers customized sizes, cut lengths, finishes, and heat-treated conditions as per customer requirements.

Q3: Are these grades suitable for heat treatment?

A3: Yes, S20C, S35C, and S45C respond well to carburizing, hardening, normalizing, and tempering processes.

Q4: Do these round bars offer good machinability?

A4: Yes, all three grades offer excellent machinability, with S20C being the easiest and S45C delivering the highest hardness after heat treatment.