DIN Ck22 Alloy Steel Bar Ck22 Round Bars Ck22 Rods

Product Description

DIN Ck22 (1.1151) Steel Overview

DIN Ck22 (also known as C22E under the EN 10083-2 standard) is a high-grade, low-carbon steel designed for engineering and automotive components. The "k" in the older DIN designation signifies a "quality" steel with low phosphorus and sulfur content, ensuring high purity and superior mechanical reliability compared to standard structural steels.

It is primarily used as a case-hardening steel or as a medium-strength engineering grade that offers a perfect blend of ductility, weldability, and toughness.

Chemical Composition (%)

Mechanical Properties (Normalized)

Typical values for Ck22 in the normalized state:

• Tensile Strength ($R_m$): 410 – 540 MPa

• Yield Strength ($R_e$): $\ge$ 210 – 240 MPa

• Elongation ($A_5$): $\ge$ 22%

• Hardness (Brinell): ~120 - 155 HB

International Equivalents

Ck22 is a staple in European engineering and corresponds to several global standards:

Key Characteristics

1. Excellent Weldability: Due to its low carbon content, Ck22 can be welded using all standard methods (MIG, TIG, Manual Arc) without the risk of brittleness or cracking in the heat-affected zone.

2. Case Hardening: While it is a soft steel, it responds exceptionally well to carburizing and nitriding. This allows for a surface hardness of approximately 58–62 HRC while the core remains tough enough to absorb shocks.

3. Cold Formability: It is highly suitable for cold drawing, bending, and pressing, making it a favorite for complex-shaped rods and wire-formed parts.

4. Machinability: In the normalized or annealed condition, it offers a machinability rating of roughly 65%–70% (relative to 1112 free-cutting steel).

Common Available Formats

• Round Bars: Available as hot-rolled (black) or bright-drawn/peeled (precision). Bright bars are preferred for CNC machining of shafts and bolts.

• Rods: Widely used in the production of high-ductility fasteners and cold-forged components.

• Forged Parts: Often used as the base material for drop-forged levers, hinges, and small mechanical arms.

Common Applications

• Mechanical Engineering: Spindles, bushings, spacers, and pivot pins.

• Automotive: Gear shift linkages, valve rockers, and small axles.

• Fasteners: Low-to-medium strength bolts, nuts, and studs (typically Grade 4.6 or 5.6).

• Tooling: Unhardened structural parts for dies and jigs.

Thermal Processing Data

• Forging: 850°C – 1100°C.

• Normalizing: 880°C – 910°C.

• Soft Annealing: 650°C – 700°C.

• Carburizing: 880°C – 980°C.

• Core Hardening: 860°C – 890°C (Water or Oil quench).

• Case Hardening: 780°C – 820°C.