การวิเคราะห์รายละเอียดของเหล็กกล้าไร้สนิม: สาเหตุและธรรมชาติ

การแนะนำ

Stainless steel is an alloy composed primarily of nickel, โครเมียม, โมลิบดีนัม, และไทเทเนียม. These elements are adjusted in varying proportions to create different grades. Stainless steel is not completely rust-proof, but it is more resistant to rust compared to regular steel.

Why Is It Called Stainless Steel?

Stainless steel is referred to as “สแตนเลส” because it is more resistant to rust. Some stainless steels are also acid-resistant, which makes them corrosion-resistant. This resistance is due to a thin, chromium-rich oxide layer, known as a passivation film, that forms on the surface. อย่างไรก็ตาม, this resistance is relative, and under certain conditions, even stainless steel can corrode.

Experiments show that as the chromium content in the steel increases, so does its resistance to corrosion in mild environments, like air and water, and in oxidizing agents such as nitric acid. When the chromium content reaches a certain level, the steel transitions from being prone to rust to becoming rust-resistant and corrosion-resistant.

การจำแนกประเภทของเหล็กกล้าไร้สนิม

Stainless steel can be classified in several ways:

By Microstructure at Room Temperature:
- มาร์เทนซิติก
- ออสเตนนิติก
- เฟอริติก
- ดูเพล็กซ์
By Chemical Composition:
- Chromium Stainless Steel
- Chromium-Nickel Stainless Steel
โดยการสมัคร:
- Nitric Acid-Resistant Stainless Steel
- Sulfuric Acid-Resistant Stainless Steel
- Seawater-Resistant Stainless Steel
By Corrosion Resistance:
- Pitting-Resistant Stainless Steel
- Stress-Corrosion-Resistant Stainless Steel
- Intergranular Corrosion-Resistant Stainless Steel
By Functional Characteristics:
- Non-Magnetic Stainless Steel
- Free-Cutting Stainless Steel
- Low-Temperature Stainless Steel
- High-Strength Stainless Steel

บทสรุป

Stainless steel is valued for its excellent corrosion resistance, ความสามารถในการขึ้นรูป, ความทน, and toughness across a wide range of temperatures. This makes it widely used in industries such as heavy industry, light industry, daily necessities, และการตกแต่งสถาปัตยกรรม.