Naing Steel stands as a trusted manufacturer and supplier in Naypyidaw, providing the backbone for Myanmar’s growing industrial sector with our High Carbon Steel C55 sheets and plates. We understand that your projects demand materials that combine strength with reliability, which is precisely what this grade offers. Sourced and processed with meticulous attention to detail, our C55 products are engineered to meet the rigorous challenges of heavy-duty applications, ensuring your work is built on a foundation of exceptional quality and enduring performance.
The composition of C55 steel is carefully balanced, featuring a carbon content that gives it a notable edge in strength and hardness. This results in a material with impressive mechanical properties, including high tensile strength and good wear resistance, making it less susceptible to deformation under significant stress. While it is less ductile than lower-carbon steels, this trade-off is what makes C55 perfectly suited for applications where durability and the ability to withstand heavy loads are the primary concerns, rather than extensive forming or shaping.
| Specification | ASTM A830/ASME SA830 |
| Thickness | 2-600mm |
| Width | 4200-11000mm |
| Length | 3000-18000mm |
| Finish | Hot rolled plate (HR) |
| Grade | C | Mn | P | S | Si | Cr | Mo | Ni | Cr+Mo+Ni |
| C55 | 0.52-0.6 | 0.60-0.90 | ≤ 0.045 | ≤ 0.045 | ≤ 0.4 | ≤ 0.4 | ≤ 0.1 | ≤ 0.4 | ≤ 0.63 |
| Mechanical properties a at room temperature in the quenched and tempered condition (+QT) | |||
| Diameter d mm | ≤ 16 | 16-40 | 40-100 |
| Thickness t mm | < 8 | 8-20 | 20-60 |
| Yield Strength Mpa | ≥550 | ≥490 | ≥420 |
| Tensile Strength Mpa | 800-950 | 750-900 | 700-850 |
| Elongation, % | ≥12 | ≥14 | ≥15 |
| Reduction of area ,% | ≥30 | ≥45 | ≥40 |
| C55 EN 10083-2 Number:1.0535 | Comparision of steel grades | |
| JIS G 4051 | S 55 C | |
| DIN 17200 | C 55 | |
| NFA 33-101 | AF70-C 55 | |
| UNI 7846 | C 55 | |
| BS 970 | 070 M 55 | |
| UNE 36011 | C 55 k | |
| SAE J 403-AISI | 1055 | |
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
This specific strength profile makes High Carbon Steel C55 sheets and plates an ideal choice for a wide array of demanding uses. They are commonly fabricated into heavy-duty springs, robust blades for agricultural and industrial machinery, and various high-wear components like gears and shafts. Furthermore, their durability is invaluable in the construction of sturdy brackets, frames, and cutting tools, where the material’s resistance to abrasion ensures a longer service life and greater operational reliability in challenging environments.
Naing Steel is a leading manufacturer, supplier and exporter of high-quality Carbon Steel, Alloy Steel, Mild Steel and Galvanized Steel products. Our extensive product range includes Pipes, Tubes, Flanges, Pipe Fittings, Forged Fittings, Sheets and Plates, catering to various industries in Naypyidaw, Myanmar.
Copyright 2025 Naing Steel. All rights reserved
