VG10 vs Cobalt Alloy: What Finished-Shear Labels Prove

VG-10 and cobalt alloy are not matching grade names, so a label-only comparison starts from unequal evidence. This guide identifies the exact maker wording and finished models, then compares material scope, geometry, heat-treatment claims, handedness, fit, condition, care, service, warranty, seller, and current transaction terms. It does not infer edge life, sharpness, toughness, corrosion behaviour, or value from cobalt content or a VG-10 name alone.

Takefu Special Steel publishes VG10 as an exact material designation. Cobalt alloy on its own is a broad description. Finished-shear makers use cobalt wording for several different materials and designations.

That difference changes the comparison. A VG10 listing may be traceable to Takefu’s producer data. A cobalt-alloy listing needs its own producer or maker designation before composition can be discussed. Neither label, by itself, decides how two finished shears will cut.

Keep the evidence levels separate

Do not fill a gap at one level with data from another. A producer composition table is not a certificate for a finished blade. A model page does not create a specification for every shear carrying similar words.

What Takefu documents for VG10

Takefu’s official VG10 page prints the designation as VG10. The producer says its chemical-composition values are representative data for the standard values of the grade.

The table does not present minimum and maximum limits. It also does not place a unit beside each composition cell. For that reason, the figures above follow Takefu’s table without adding a range or basis that the page does not state.

Takefu displays a value meaning HRC 60 or above in the VG10 material row. Keep that entry with the producer document. It is not a universal finished-shear value.

Takefu’s original blade-steel index lists VG10, VG10W, and Cobalt Special (CoSP) separately. A shared cobalt element or a similar name does not make those designations interchangeable.

Why cobalt alloy is not one grade

The primary maker sources use cobalt wording in different ways.

Jaguar’s KAMIYU page calls the model’s material VG10 cobalt steel. This puts VG10 and cobalt wording in the same finished-shear statement.

Joewell’s material page distinguishes CBA1 from CBA12 within its cobalt base alloys. Its New Cobalt Offset page writes the model’s material as Cobalt Base Alloy CBA-1. Joewell’s current cutting-scissors index states that CBA-1 contains about 50 percent cobalt. That figure belongs to Joewell’s CBA-1 statement. It does not set a composition for every cobalt-alloy shear.

Mizutani publishes separate official material pages for Extramarise I Cobalt Alloy and Extramarise II Cobalt Alloy. The maker pairs TWIG with Extramarise I and ACRO TYPE-K with Extramarise II.

These are distinct source labels. Do not collapse VG10 cobalt steel, CBA-1, CBA12, Extramarise I, and Extramarise II into one chemistry or one performance category. If a page says only cobalt alloy, record it as broad wording until the maker supplies a more exact designation.

Exact finished-shear evidence

This worksheet records only what each linked maker page says about the named model.

Jaguar’s 59 HRC and Takefu’s value of HRC 60 or above sit at different evidence levels. The first is a finished-model maker specification. The second is a material-producer table entry. They do not form a VG10 range, and this page does not treat either as an independent batch measurement.

What these sources do not establish

The reviewed primary sources do not provide one controlled, like-for-like trial between all VG10-labelled shears and all shears labelled cobalt alloy. They do not support universal claims for:

• edge life or sharpening intervals;
• sharpening method or difficulty;
• corrosion or impact behaviour in salon use;
• toughness, drop response, or blade damage;
• price, value, market tier, or material ranking;
• country of a finished shear based on its material label;
• suitability for one cutting technique based on the broad label alone; or
• a performance winner between finished shears.

Blade geometry, edge finish, pivot, tension, size, and handle are finished-tool records. Check those on the exact maker page alongside the material statement.

A decision flow for two exact shears

1. Fix the product identity. Record maker, model, variant, size, handedness, and the official product route.
2. Copy the material wording. Keep VG10, VG-10, cobalt steel, cobalt base alloy, and cobalt alloy exactly as the maker prints them.
3. Look for an exact designation. A named grade such as VG10 or a maker designation such as CBA-1 carries more information than cobalt alloy alone.
4. Find the right document. Link a producer document for the exact grade and a maker page for the exact finished shear. Keep their claims in separate columns.
5. Check blade scope. Record whether the source covers both blades, one blade, an insert, or another part. Leave the field open if the source does not say.
6. Handle hardness as a model field. Record HRC only when the source identifies the value’s scope. Do not import a material-table entry into a finished shear.
7. Compare published finished-tool details. Use the two maker pages to compare geometry, edge, pivot, handle, size, care, and service information. Ask the maker about any missing field.

The result may be two well-documented models with different material wording. That is a useful comparison. It does not need a generic steel winner.

Blank comparison worksheet

For more detail on the exact Takefu designation, see the VG-10 steel reference. Use the composition guide and hardness reference to keep material data and finished-tool claims in the right scope.

Primary sources and limits

Only official producer and maker pages are used as technical authority. Retailer steel guides, marketplace listings, generic comparison charts, surveys, price calculations, and unsourced performance claims are excluded.