STANDARD FIRST · ENGINEERING FIRST
Cold Heading Material Engineering Classroom
Engineering knowledge that connects formal standards, material behavior and cold heading practice.
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Engineering classroom articles
Talking about "roundness" during Mid-Autumn Festival: Why do most cold-headed wire rods start from a round wire?
Why do most cold heading wires start from a round wire? When transforming from a round wire to a shaped wire, what tru…
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The hardness results look normal, so why does cracking still occur after cold heading?
Cracks, hardness tests, and machine screen images are all right in front of us. The issue is not whether there is a si…
Read article →Cold heading material—does it really get better the softer it is?
Customers often don't want "low hardness"; they want "easier to form." When working with cold-heading materials, you'l…
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What is the difference between a converter and an electric furnace? Which type of steel is better?
Schematic diagrams of the basic oxygen furnace and the electric arc furnace, not actual photos from the customer's ste…
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Cold heading causes surface roughness. Why does it still cause surface roughness even after changing the material?
Starting from a customer complaint about 20MnB4 oil pipe nuts: "This batch of material is hard to work with; let's try…
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Is cold heading and surface roughening caused by the phosphating film being too thin?
Cold heading parts often exhibit surface scratches, and on-site requests frequently arise: "For the next batch of mate…
Read article →Cold Heading Engineer Classroom · Failure Analysis Series - Case 01 / Cold Heading Forming Cracking: The Bolt Flange Has Cracked into a Mesh Pattern
Case 01 / Cracking in Cold Forging — The Bolt Flange Has Turned into a Mesh: Tracing the Cause Through Lamellar Struct…
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The sample can be successfully upset, so why does it “change its appearance” once mass production begins?
Cold Heading Material Engineer Classroom · Chapter Ten During the sample submission, forming went smoothly, dimensions…
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Case Study of Mass Production of S55C Ultra-Thin-Walled Tubes via Cold Forging for a Leading Global Automotive Components Customer: How Material Stability Determines Tool Life
Taking the ultra-thin-walled cold-formed tube S55C for a leading international automotive parts customer as an example…
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With the same material, why does cold heading performance differ when using a different machine?
Engineer's Classroom · Chapter 9 | Material Suitability and Actual Processing Conditions In the previous chapter, we d…
Read article →The same material, why does it become difficult to upset when switched to another product?
Chapter 8: Product Structure and Forming Operations Chapter 8 Homepage Image A common situation often occurs at cold h…
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Phosphating appears normal, so why does it still fail during cold heading?
Chapter 7: A qualified coating does not necessarily mean effective lubrication after deformation. At cold heading site…
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The same wire, why does some become easy to upset after drawing while others do not?
Chapter 6: The wire has been drawn thinner, and the material's properties have also changed. At cold heading sites, on…
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Where do surface defects come from? Why are they carried all the way to the cold-headed finished product?
From continuous casting billets, wire rod rolling, transportation and transfer, pickling and remaking, to wire drawing…
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Chapter 4: Spheroidization Rate Is Qualified, But Why Are Some Materials Still Difficult to Upset?
The purpose of spheroidizing annealing is to improve the cold-forming capability of medium-carbon steels and alloy ste…
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Why do only a few products crack in the same batch of materials?
Chapter 3: Average Qualification Does Not Mean There Are No Local Risks At the cold heading site, one type of anomaly…
Read article →Why do problems still occur in cold heading even when the material is qualified? Chapter 2: What exactly do material standards control? Why can't standards replace process validation?
In the previous chapter, we discussed a core point: meeting material standards does not necessarily mean that cold hea…
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Why Problems Still Occur in Cold Heading Even When the Material Meets Standards – Chapter 1: Standard Compliance Does Not Equal Cold Heading Stability
"Why do problems still occur in cold heading even when the material is qualified?" The material is "qualified," so why…
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What is the difference between ML40Cr and 40Cr? It's not just that there's an extra "ML".
In the selection of cold-heading wire and high-strength fasteners, 40Cr is a very common grade. Many customers, upon s…
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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, an…
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Why does SWRCH10A become SWCH10A? Where did that R go?
This article explains the difference between SWRCH10A and SWCH10A in a simple way: "R" stands for Wire Rod, and after…
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Why are high-demand square nuts more suitable for cold heading with square-shaped wire?
This article takes the cold heading of square nuts as an example to illustrate why high-demand special-shaped parts ar…
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Why is it called SUJ2? Understand the Japanese JIS Steel Naming System in One Article
SUJ2 is not a randomly combined material code; rather, it is a bearing steel grade within Japan's JIS steel designatio…
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Why is it called SCM435? — Understand the Japanese JIS Steel Naming System in One Article
This article analyzes the naming logic of SCM435 based on the Japanese JIS G 4053 standard: "S" stands for Steel, "C"…
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What materials are SAE 1022A, 1010A, 1008A, and 1006A? Do these grades actually exist?
This article analyzes the commercial designations such as 1022A, 1010A, 1008A, and 1006A within the SAE/JIS standard s…
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