内容
A2 Stainless Steel: Properties, Characteristics And Comparison
- ジョン
A2 stainless steel is highly regarded for its exceptional corrosion resistance and durability. It has become a popular choice for tools and fasteners designed to endure tough and demanding conditions.
This article provides a comprehensive overview of A2 stainless steel, covering its composition, properties, and applications. It also explores the different subgrades—A2-50, A2-70, and A2-80—and offers a comparison between A2 stainless steel and other stainless steel grades such as 304, A4, and A8.
A2ステンレス鋼とは？
A2 stainless steel is an austenitic stainless steel. It contains about 65-70% iron (Fe) content, 18-20% chromium (Cr) content, and 8-10.5% nickel (Ni) content, with small amounts of carbon, manganese, and silicon. It has a silvery, slightly reflective surface. Its corrosion resistance is great. And it has a balance of durability and workability. Its common uses include kitchen equipment, architectural elements, automotive components, and chemical containers.
- A2ステンレス鋼は304と同じですか？
同じではないが、密接に関連している。304は国際的な合金分類である。A2は、一般的にステンレス鋼ファスナーに使用される欧州の呼称であり、一般的に304ステンレス鋼を指します。
A2ステンレス鋼の同等品
| 国/地域 | 規格/仕様 | 同等グレード |
| 中国 | GB/T 1220、GB/T 20878 | 06Cr19Ni10（または304） |
| アメリカ | A276, A240 | 304 |
| EU | EN 10088-2 | X5CrNi18-10 (1.4301) |
| ドイツ | DIN EN 10088-2 | X5CrNi18-10 |
| 日本 | JIS G4303 | SUS304 |
| イングランド | BS EN 10088-2 | 304S15 |
A2ステンレス鋼のサブグループ
A2 stainless steel, widely recognized for its excellent corrosion resistance in non-marine environments, is categorized into three subgrades: A2-50, A2-70, and A2-80. These classifications are based on their tensile strength and mechanical properties, making them suitable for a variety of applications:
- A2-50: Ideal for low-stress, flexible applications and is the most cost-effective option.
- A2-70: The most commonly used grade, popular in fasteners like bolts and nuts due to its balance of strength and affordability.
- A2-80: Offers the highest strength with reduced ductility, making it extremely durable but also the most expensive choice.
Here’s a table comparing A2-50, A2-70, and A2-80 stainless steel materials for tensile strength, cost, and other key properties:
| プロパティ | A2-50 | A2-70 | A2-80 |
| 引張強度 | ≥500 N/mm² | ≥700 N/mm² | ≥800 N/mm² |
| 0.2% Yield Strength | ≥210 N/mm² | ≥450 N/mm² | ≥600 N/mm² |
| 伸び | ≥0.6d | ≥0.4d | ≥0.3d |
| アプリケーション | Light-duty like low-stress components) | General-purpose like fasteners | Heavy-duty like automotive parts |
| コスト | 低い | 中程度 | 高い |
A2ステンレス鋼の成分
| エレメント | Cr | ニー | C | ムン | P | S | Si | N |
| wt% | 18.0 – 20.0 | 8.0 – 10.5 | ≤ 0.08 | ≤ 2.0 | ≤ 0.045 | ≤ 0.03 | ≤ 1.0 | ≤ 0.10 |
A2ステンレス鋼の機械的性質
| プロパティ | 価値 |
| 引張強度 | 515 - 740 MPa |
| 降伏強度 | 205 MPa（最小） |
| ブリネル硬度（HB） | 123 - 201 HB |
| ロックウェル硬度（HRC） | 70 - 88 HRC |
| ビッカース硬度（HV） | 129 - 200 HV |
| 伸び | 40%（50mm単位） |
| 弾性係数 | 193 GPa |
A2ステンレス鋼の物理的性質
| プロパティ | 代表値（メートル法） | 代表値（インペリアル） |
| 密度 | 7.75 g/cm³ | 0.280 lb/in³ |
| 融点 | 1,480°C | 2,696°F |
| 熱伝導率 | 24.9 W/m-K | 173 BTU・in/hr・ft²・°F |
| 熱膨張 | 10.2 µm/m-°C | 5.7 µin/in-°F |
| 電気伝導率 | 1.25 x 10⁶ S/m | 2.15% IACS |
- A2ステンレスは磁性を持つか？
A2ステンレス鋼は、焼鈍状態では磁性を持たない。しかし、冷間加工や溶接を施 すと、わずかに磁性を帯びることがある。これは、磁気特性が要因となる用途では重要である。
Performance of A2 Stainless Steel
優れた耐食性
A2ステンレス鋼はクロムを多く含む。そのため耐食性に優れている。そのため、酸、水分、アルカリにさらされる環境に適しています。厨房機器、化学容器、建築部材などの用途に適しています。
Limitation
It is not suitable for marine environments or chloride-rich applications due to susceptibility to pitting and stress corrosion cracking. For these environments, higher-grade stainless steels like A4 (316) are recommended.
適度な耐熱性
A2 stainless steel can withstand continuous operating temperatures up to 870°C and short-term exposure up to 925°C. Its performance makes it suitable for applications involving moderate heat exposure, such as industrial piping, cookware, and heat exchangers.
Limitation
A2 stainless steel experiences carbide precipitation between 425℃と870, reducing corrosion resistance in welded areas. Its strength also decreases above 500°C, limiting use in high-stress, high-temperature applications.
中程度の強さ
A2 stainless steel offers moderate strength, with a tensile range of 500–750 N/mm², suitable for structural and industrial use. It balances durability and ductility.
Limitation
It is not ideal for high-strength or heat-intensive applications due to its alloy composition and performance limitations at elevated temperatures.
成形のしやすさ
A2ステンレス鋼は加工性に優れ、成形が容易です。このため、曲げ加工、プレス加工、複雑な形状への成形が必要な製造工程に最適です。
耐寒性
A2ステンレス鋼は極低温でも強度を維持し、-196℃まで耐える。極低温用途をはじめ、高い靭性が要求される環境に適しています。
優れた溶接性
A2 stainless steel is highly weldable due to its austenitic microstructure. It is suitable for most common welding techniques, including TIG, MIG, and resistance welding without requiring post-weld heat treatment in most cases.
However, precautions are needed to avoid carbide precipitation in the heat-affected zone (HAZ) at temperatures between 425°C and 870°C.
美的多様性
A2ステンレススチールは、滑らかで反射性のある仕上げに研磨することができ、目に見える用途や装飾的な用途に魅力的な選択肢となります。
- A2は研ぎやすいか？
Yes, A2 stainless steel is relatively easy to sharpen because its hardness is balanced with a fine grain structure, which helps achieve a sharp edge without excessive difficulty. A2 can be a good knife.
A2ステンレス鋼は何に使われるのか？
A2 stainless steel is most widely used in the production of fasteners. Here’s a look at the main fields of applications of A2 stainless steel.
| 申し込み | 用途 | プロパティ |
| フード＆ビバレッジ | 厨房機器、貯蔵タンク | 耐腐食性、衛生的 |
| 建設・建築 | 建物のファサード、手すり | 耐久性、審美性 |
| 自動車 | 排気システム、トリム | 耐熱性、耐食性 |
| 医療機器 | 手術器具 | 非反応性、滅菌可能 |
| 化学処理 | タンク、パイプ | 耐酸性、耐アルカリ性 |
Common Product Forms of A2 Stainless Steel
シートとプレート
A2 stainless steel is commonly rolled into thin sheets or thick plates, available in various dimensions. Its smooth surface is easy to clean and maintain, making it ideal for food-grade and hygienic applications.
- Fabrication of kitchen equipment, countertops, and sinks.
- Used in industrial machinery for enclosures and structural panels.
バーとロッド
A2 stainless steel is produced in round, square, or flat bar forms for manufacturing precision components. It offers a good combination of machinability and corrosion resistance, making it reliable for precision work.
- Machined into shafts, pins, and gears in mechanical engineering.
- Used in decorative elements such as railings and handles.
チューブとパイプ
Tubular forms of A2 stainless steel, including seamless and welded pipes, are widely available. Its non-magnetic and anti-corrosive properties are suitable for non-critical piping applications.
- Plumbing systems in residential and commercial buildings.
- Automotive exhaust systems require moderate corrosion resistance.
ワイヤー
A2 stainless steel wires are manufactured in various diameters and forms, such as coils or straight lengths. Its high strength, resistance to wear, and excellent flexibility make it ideal for dynamic or high-precision uses.
- Formed into wire mesh for filtration, fencing, or reinforcement.
- Used for springs in mechanical systems or precision equipment.
Differences Between A2, A4 And, A8 Stainless Steel
Under the ISO 3506 standard, オーステナイト系ステンレス steels are classified as A1, A2, A3, A4, A5, and A8. Among these, A2, A4, and A8 are widely used, with A2ステンレス鋼 being the most common due to its excellent versatility and corrosion resistance.
A4対A2、316対304
A2ステンレス鋼は、日常的な環境では良好な耐食性を発揮するが、高塩化物地域では効果が劣る。A4ステンレス鋼は、塩化物や酸に対する耐性が高い。A2よりも高価である。
A2は厨房機器や屋内構造物のような一般的な用途に使用される。A4は、海洋環境や化学プラントなどの過酷な環境に適している。
A8対A2
A8ステンレス鋼は耐摩耗性に優れるが、耐食性はA2に比べて劣る。
A8は耐久性に優れるが、加工しにくく、延性に劣る。A2ステンレス鋼は成形や溶接が容易である。
A2は台所用品、ファスナー、屋内構造物に使用される。A8は、切削工具や産業機械など摩耗の激しい用途に使用される。
A2ステンレス鋼と18-8ステンレス鋼の比較
A2ステンレス鋼と 18-8ステンレス鋼 成分的には基本的に同じです。「18-8」はこのタイプのステンレス鋼の一般的な説明ですが、「A2」は留め具によく使用される特定のヨーロッパの指定です。
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