Carbon steel, alloy steel, tool steel, bearing steel, and mold steel machining guides.
Machine shops see a steady stream of RFQs for low-carbon structural steel parts. When “Q215” appears in the mater…
A torn thread on a cold-formed pin rarely points to a bad CNC program. More often, the material certificate says Q195, and the shop programs it like AISI 1018. The result: built-up edge, stringy ch…
The first thing to check when a part print calls out 08F is not the hardness column on a datasheet. It is how the blank was made. Cold drawn 08F bar stock behaves differently on a CNC lathe than a …
A drawing arrives with “15F” in the material block, often from a legacy automotive or appliance design. The immediate reaction in a CNC shop is to treat it like any low-carbon steel. That misses th…
When a drawing calls out 10F, many shops file it mentally next to 1010 or 1008 and program accordingly. The ca…
When a drawing calls for 60 carbon steel, the conversation in a machine shop usually shifts quickly from “what is it” to “how was it supplied.” The same C60 bar can behave very differently under a …
Every machine shop has a category of work that tests the balance between material cost, machinability, and final performance. A batch of C55 shafts, gear blanks, or die plates lands in that categor…
A shaft drawing marked only “C50” usually arrives with bar stock that has been hot rolled or normalized. The mill certificate tells one story, but the machinist on the floor has to translate that i…
A medium-carbon grade like C40 often looks unremarkable on a drawing, but it punishes shops that ignore material condition and chip control. The difference between a clean run and a pile of scrappe…
A batch of C35 shaft blanks arrives on the shop floor with a normalized hardness around 180 HB. The print calls out tight bearing seats, a keyway, and a surface finish of Ra 1.6 µm. C35 looks like …
Walk into many European job shops and you will see C30 bars mixed with C45 on the rack. Both look like plain medium carbon steel, but C30 behaves differently at the spindle. If you program it like …
If a drawing lands on your desk specifying C25, you are not dealing with an exotic alloy or a chip-breaking nightmare. This medium carbon grade sits in the sweet spot between easy-to-machine low-ca…
Low-carbon 20 / C22 bars often look like the easiest job on the traveller until the first finishing pass comes off with a ragged chip and a dull edge. The material is cheap, welds easily, and case …
If you machine a 20Cr blank at 197 HBW with coated carbide, insert life frequently drops to around 40 minutes. Normalize the same bar first and the identical insert can run past 90 minutes on compa…
The first time a batch of 38CrMoAl bar stock hit incoming inspection, the drawing said 41CrAlMo7, but the heat number read 38CrMoAl. A quick call confirmed the grades were equivalent for the part—b…
Ordering 35CrMo bar stock without pinning down one variable usually costs more than the material itself. Two prints can call out 34CrMo4 and 35CrMo for the same shaft, but one may arrive annealed a…
A drive shaft drawing lands on the desk with a material callout: 42CrMo4, quenched and tempered to 28–32 HRC. The immediate question isn’t whether the shop can mill it. The real question is whether…
A drawing note that reads “20CrMnTi, carburize to HRC 58–62” triggers a different machining sequence than a note for 18CrMo4. Both are low-carbon alloy steels intended for case hardening, but the t…
NAK80 plastic mold steel (10Ni3MnCuAl, ~40 HRC prehardened) for CNC machining: composition, hardness limits, tooling and when P20 or 1.2344 fits better.
Short answer for the drawing: Q235B is a Chinese low-carbon structural steel to GB/T 700-2006, not a free-machining or heat-treatable grade. It suits welded frames, brackets, base plates and lightly l…
