🟦 Product Overview
1045 (C45) Medium Carbon Steel Bar is one of the most widely used high‑strength carbon steels for:
Machinery components
Shafts & axles
Gears & bolts
Automotive parts
General engineering
Compared with low carbon steels (1018 / 1025 / A36), 1045 offers significantly higher strength and hardness , while still maintaining good machinability and toughness.
It is the global standard for medium carbon steel due to its:
High tensile strength
Good wear resistance
Excellent machinability
Ability to be heat treated (quenching & tempering)
🟦 Standards
ASTM A29 (1045)
ASTM A108 (cold‑finished bars)
JIS S45C
DIN C45 / 1.0503
GB 45#
🟦 Grade Included
1045 / C45 / S45C / 45# (All equivalent medium carbon steel grades)
🟦 Product Specifications & Available Sizes
Shapes Available
Round Bar
Square Bar
Flat Bar
Hex Bar
Diameter Range Length Surface Conditions
Hot Rolled
Cold Drawn
Peeled / Turned
Polished
Quenched & Tempered (Q+T)
🟦 Chemical Composition（1045 / C45）
Element Content (%) C 0.43–0.50 Mn 0.60–0.90 Si 0.15–0.35 P ≤ 0.040 S ≤ 0.050
🟦 Mechanical Properties（As Rolled）
Property Requirement Tensile Strength 570–700 MPa Yield Strength 300–350 MPa Elongation 16–20% Hardness 170–210 HB
🟦 Mechanical Properties（After Q+T Heat Treatment）
Property Requirement Tensile Strength 700–900 MPa Yield Strength 450–600 MPa Hardness 200–260 HB
🟦 Physical Properties
Property Value Density 7.85 g/cm³ Melting Point ~1450°C Magnetic Yes
🟦 Manufacturing Processes
Hot Rolling
Cold Drawing
Turning / Peeling
Grinding / Polishing
Quenching & Tempering (Q+T)
Straightening
Ultrasonic Testing
🟦 Primary Industry Usage
Machinery & equipment
Shafts, axles, pins
Gears, bolts, studs
Automotive components
Hydraulic parts
General engineering applications
🟦 Why Use 1045 Medium Carbon Steel
Higher strength than mild steel
Good wear resistance
Excellent machinability
Suitable for heat treatment
Ideal for high‑load mechanical parts
🟦 Why Choose WelSteels
Full size range of 1045 / C45
Hot rolled, cold drawn, and Q+T options
MTC 3.1 + third‑party inspection
Export‑grade packaging
Competitive pricing for global buyers
International Carbon Steel Grade
America Japan Germany Britain France Italy Spain Switzerland China AISI/SAE JIS W‐nr. DIN BS EN AFNOR UNI UNE SS GB A570.36 STKM 12A 1.0038 RSt.37‐2 4360 ‐ E 24‐2 ‐ ‐ 1311 15 – STKM 12C – – 40 C – Ne – – – – 1015 ‐ 1.0401 C15 080M15 ‐ CC12 C15, C16 F.111 1350 15 1020 ‐ 1.0402 C22 050A20 2C CC20 C20, C21 F.112 1450 20 1213 SUM22 1.0715 9SMn28 230M07 1A S250 CF9SMn28 F.2111 1912 Y15 11SMn28 12L13 SUM22L 1.0718 9SMnPb28 ‐ ‐ S250Pb CF9SMnPb28 11SMnPb28 1914 ‐ ‐ ‐ 1.0722 10SPb20 ‐ ‐ 10PbF2 CF10Pb20 10SPb20 ‐ ‐ 1215 ‐ 1.0736 9SMn36 240M07 1B S300 CF9SMn36 12SMn35 ‐ Y13 12L14 ‐ 1.0737 9SMnPb36 ‐ ‐ S300PB CF9SMnPb36 12SMnP35 1926 ‐ 1015 S15C 1.1141 Ck15 080M15 32C XC12 C16 C15K 1370 15 1025 S25C 1.1158 Ck25 ‐ ‐ ‐ ‐ ‐ ‐ 25 A572-60 ‐ 1.890 StE380 4360 55 ‐ ‐ FeE390KG ‐ 2145 ‐ 1035 ‐ 1.0501 C35 060A35 ‐ CC35 C35 F.113 1550 35 1045 ‐ 1.0503 C45 080M46 ‐ CC45 C45 F.114 1650 45 1140 ‐ 1.0726 35S20 212M36 8M 35MF4 ‐ F210G 1957 ‐ 1039 ‐ 1.1157 40Mn4 150M36 15 35M5 ‐ ‐ ‐ 40Mn 1335 SMn438(H) 1.1167 36Mn5 ‐ ‐ 40M5 ‐ 36Mn5 2120 35Mn2 1330 SCMn1 1.1170 28Mn6 150M28 14A 20M5 C28Mn ‐ ‐ 30Mn 1035 S35C 1.1183 Cf35 060A35 ‐ XC38TS C36 ‐ 1572 35Mn 1045 S45C 1.1191 Ck45 080M46 ‐ XC42 C45 C45K 1672 Ck45 1050 S50C 1.1213 Cf53 060A52 ‐ XC48TS C53 ‐ 1674 50 1055 ‐ 1.0535 C55 070M55 9 ‐ C55 ‐ 1655 55 1060 ‐ 1.0601 C60 080A62 43D CC55 C60 ‐ ‐ 60 1055 S55C 1.1203 Ck55 070M55 ‐ XC55 C50 C55K ‐ 55 1060 S58C 1.1221 Ck60 080A62 43D XC60 C60 ‐ 1678 60Mn 1095 ‐ 1.1274 Ck101 060A96 ‐ XC100 ‐ F.5117 1870 ‐ W1 SK3 1.1545 C105W1 BW1A ‐ Y105 C36KU F.5118 1880 ‐ W210 SUP4 1.1545 C105W1 BW2 ‐ Y120 C120KU F.515 2900 ‐
