COLD HEADING MATERIAL ENGINEERING CLASSROOM · RX-CE-008
What is the difference between 35CrMo and ML35CrMo? We will explain everything clearly, from standards and composition to cold heading suitability.
35CrMo and ML35CrMo have similar compositions, but differ in standard specifications, chemical composition control, and suitability for cold heading. This article compares GB/T 3077, GB/T 6478, and GB/T 28906-2025 to explain why simply looking at the grade is insufficient when selecting materials.
35CrMo and ML35CrMo have similar compositions, but differ in standard specifications, chemical composition control, and suitability for cold heading. This article compares GB/T 3077, GB/T 6478, and GB/T 28906-2025 to explain why simply looking at the grade is insufficient when selecting materials.
RX-CE-008Engineering knowledgeCreation Group Technical Team
E-E-A-T
Technical trust signals
AuthorCreation Group Technical TeamTechnical reviewCreation Group Materials Engineering TeamUpdated2026-08-19Referenced standards
GB/T 3077
GB/T 6478
GB/T 28906
--|
| Material Grade | Is 35CrMo required, or explicitly ML35CrMo? | |
| Applicable Standard | GB/T 3077, GB/T 6478, or GB/T 28906? | |
| Purchase Form | Round bar, wire rod, or hot-rolled coil? | |
| Subsequent Processes | Does the process include drawing, spheroidizing annealing, cold forging, or tempering? | |
| Product Grade | Is it 8.8, 10.9, or 12.9 class fastener? | |
| Forming Challenges | Are there large deformation zones, heads, flanges, or complex geometries? | |
| Quality Control | Are decarburization, inclusions, surface defects, and batch-to-batch consistency critical concerns? | |
### VI. Summary
35CrMo emphasizes the strength and heat-treatment performance of alloy structural steels, while ML35CrMo highlights the forming stability and production reliability of cold-forged materials.
For general mechanical components, 35CrMo might suffice; however, for high-strength bolts, flanged bolts, and specially shaped cold-forged parts—especially those rated 10.9 or 12.9—ML35CrMo is often the preferred choice for efficient cold-forging production.
At Creation Group, when recommending 35CrMo, ML35CrMo, or related cold-forging wire rods, we never base our decision solely on the material grade. Instead, we consider the customer’s drawings, product specifications, deformation requirements, performance levels, heat-treatment needs, purchase form, and historical production experience to determine whether a material truly suits cold-forging mass production.
After all, for fasteners, similarity does not equate to substitutability; only optimal matching ensures long-term stability.
Creation Group supports cold heading wire, shaped wire and cold-drawn seamless shaped tube projects with material, process and failure-analysis engineering.
