在选择优质的折刀的时候，应该格外注意刀片所选用的钢材。钢材真的是刀片的精髓所在，一把刀的表现优劣主要取决于钢材。钢的本质是一种含碳的铁合金，一般还富含其他元素，以此来提高某些性能，适应不同用户需求。

When choosing a high-quality folding knife, special attention should be paid to the steel selected by the blade.Steel is really the essence of the blade, the performance of a knife mainly depends on the steel.The essence of steel is a carbon-containing iron alloy, generally rich in other elements, in order to improve some performance, to adapt to the needs of different users.

刀片用钢及刀片的生产方法生产步骤为炼钢(电炉)→炉外精炼→铸锭→电渣重溶→高温扩散退火→下料锻造(成刀片锻坯)→软化退火→粗加工(扒皮)→组织处理(三次高温正火、高温回火、油淬、低温回火)→半精加工→调质处理(淬火、二次回火)→精加工成产品。

Blade with steel and blade production method production steps for steelmaking (electric furnace) furnace refining ingot slag heavy dissolved high temperature diffusion annealing forging (blade forging) softening annealing rough processing (peeling) tissue treatment (three high temperature ignition, high temperature tempering, oil quenching, low temperature tempering) semi-finishing processing (quenching, secondary tempering) finishing into products.

冷轧锯条钢（碳素工具钢）的牌号：45Mn、65Mn、T8、T8A、T9、T9A 、T10、 T10A、 T11、 T11A、 T12 、T12A 、T8MnA。

Plate of cold rolled saw strip steel (carbon tool steel): 45Mn, 65Mn, T8, T8A, T9, T9A, T10, T10A, T11, T11A, T12, T12A, T8MnA.

在钢材的正确使用硬度范围内，随着硬度范围内，随着硬度的提高，韧性下降。而耐磨性是钢能够承受磨损的能力。当较硬的颗粒通过较软的表面时会发生磨损。在硬度相同的钢中，具有较大碳化物的钢（认为是微观的，坚硬的，耐磨的颗粒）通常可以更好地抵抗磨损。然而，碳化物会变脆并且开裂，从而降低韧性。

Within the correct use of steel hardness range, with the hardness range, with the improvement of hardness, the toughness decreases.Wear resistance is the ability of steel to withstand wear.Wear occurs when the harder particles pass through the softer surface.In steel with the same hardness, steel with larger carbide (considered microscopic, hard, wear-resistant particles) is usually better resistant to wear.However, the carbide becomes brittle and cracks, thus reducing the toughness.

刀的好坏决定因素有三个：材质、热处理还有刃口形状，而决定一把刀具最重要的当属材质，目前现在市面上常见的刀具按材质大体上可分为高碳钢、一般不锈钢、高碳不锈钢、高碳锰钢、陶瓷、钛合金等六类。

There are three determining factors for the quality of the knife: material, heat treatment and the shape of the edge, and the most important decision of a tool is the material. At present, the common tools on the market can be generally divided into high carbon steel, general stainless steel, high carbon stainless steel, high carbon manganese steel, ceramic steel, titanium alloy and other six categories.