Lohmann LO-R 4528 Stainless Steel (N690 Equivalent)

Lohmann LO-R 4528 Stainless Steel is an equivalent of Bohler’s popular N690 knife steel.

A Good martensitic stainless steel with good edge holding ability at a recommended working hardness 58-60HRC. It is used for all kinds of shaped and flat knives in the food processing industry, e.g. cutter knives and knives in the fish-processing industry.

Similar to Takefu VG-10 steel, which is a very popular steel for kitchen knives, fixed blades and folders.  It has 17% Chromium vs. 14% in VG-10, which makes it considerably more stain resistant, but a bit less tough.

Thickness may vary slightly. 3,2mm – 3,6mm & 4,2mm – 4,5mm

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Corrosion-resistant steels

Corrosion-resistant steels are characterised by increased resistance to acids and corrosion. They are basically divided into the categories of austenitic, ferritic, and martensitic steel.
Martensitic corrosion-resistant steels offer high protection against corrosion in the hardened state, excellent wear resistance, and outstanding cutting edge retention.
Austenitic corrosion-resistant steels offer very good corrosion resistance and very good hot and cold form-ability. They are generally cryogenic steels.
Ferritic corrosion-resistant steels are generally low in nickel and exhibit high resistance to chloride-induced stress corrosion cracking.

Heat Treatment Specifications for Lohmann LO-R 4528 Stainless Steel:

Soft Annealing: 800 – 850°C, Furnace cooling <550°C, then air cooling
Hardening: 1000 -1040°C, Oil quenching in a MEDIUM oil, we recommend PQ20 (DO NOT use vegetable oils, it is not designed for this process, and you will not get the constant results you need)
Tempering: 180 – 200°C, (preferred tempering range), for 55 – 58 HRC.

For the tempering diagram see: https://www.lohmann-stahl.de/fileadmin/redaktion/downloads/1.4528.pdf

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2,5mm x 80mm x 1m, 3,3mm x 80mm x 1m, 4,5mm x 80mm x 1m, 4,2mm x 80mm x 1m, 5,5mm x 80mm x 1m, 6.6mm x 80mm x 1m



Lohmann is a global leader in the manufacture of High-Speed Steel, Tool Steel, and Special Steel grades and abrasion-resistant specialty steel and heat-resistant castings. They have been developing and producing high-standard, market-leading products in these sectors for over 225 years.
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