sae 1112 構造鋼: プロパティのガイド, 用途 & 製造

If you’re seeking a steel that balances形成性, 強さ, and affordability for projects like automotive parts, small machine components, or light structural frames—sae 1112 構造鋼 is your ideal match. As a low-carbon, free-machining steel (with 0.10–0.15% carbon), it’s easy to shape and weld while offering more strength than lower-carbon grades. このガイドは、選択に必要なすべてを分類します, 使用, and maximize SAE 1112 for your tasks.

1. Material Properties of SAE 1112 構造鋼

SAE 1112’s performance stems from its well-balanced化学組成—low carbon for workability, plus controlled manganese for added strength. Let’s explore its key traits in detail.

化学組成

sae 1112 is a low-carbon, sulfur-enhanced steel (for free machining) with minimal impurities. Here’s its exact composition (per SAE standards):

物理的特性

These traits make SAE 1112 easy to integrate into manufacturing and construction:

• 密度: 7.85 g/cm³ (same as most structural steels—simplifies weight calculations for parts like shafts or brackets)
• 融点: 1425–1538°C (compatible with standard welding, 鍛造, and rolling processes)
• 熱伝導率: 51.9 w/(M・k) (spreads heat evenly—reduces warping when welding or forming thin sections)
• 熱膨張係数: 12.0 µm/(M・k) (low enough to handle seasonal temperature swings in buildings or machinery)
• 電気抵抗率: 1.67 µΩ・m (not used for electrical components, but useful for safety planning in industrial settings)

機械的特性

sae 1112 offers more strength than lower-carbon steels (like SAE 1005) while staying workable. Here are its key performance metrics:

• 抗張力: 515–655 MPa (handles moderate pulling forces—ideal for automotive axles or machine shafts)
• 降伏強度: 310–440 MPa (maintains shape under load—critical for structural components like light beams)
• 硬度: 160–210 HB (resists wear from friction—durable for gears or tractor parts)
• 衝撃の靭性: 高い (absorbs small impacts without breaking—great for agricultural machinery)
• 延性: 高い (曲がることができます, 刻印, or extruded into complex shapes—e.g., 送信コンポーネント)
• 伸長: 15–20％ (stretches significantly before breaking—avoids sudden failure in use)
• 疲労抵抗: 適度 (works for parts with occasional stress, like garage door springs)
• 骨折の靭性: 高い (prevents catastrophic breaks—safe for everyday use in machinery)

その他の重要なプロパティ

• 良い溶接性: Joins easily with MIG, ティグ, or stick welding—no preheating needed for sections up to 10 厚さmm (saves labor on projects).
• 優れた形成性: ホットロールすることができます, cold-stamped, or forged into parts of all sizes (from tiny gears to light beams).
• 中程度の腐食抵抗: Resists rust in dry indoor environments—needs coating (galvanizing or paint) for outdoor or wet use.
• タフネス: Performs reliably in temperatures from -10°C to 50°C (suitable for most temperate climates).

2. Applications of SAE 1112 構造鋼

SAE 1112’s blend of strength and workability makes it a top choice across industries—especially where machining and shaping are key. 現実世界の問題を解決する方法は次のとおりです:

機械工学

Mechanical engineers rely on SAE 1112 for small-to-medium components:

• ギア: Small to medium gears for industrial conveyors or household appliances (its free-machining trait lets tools cut teeth smoothly).
• シャフト: Drive shafts for small motors or pumps (handles rotational stress without bending).
• 機械部品: ブラケット, ハウジング, およびファスナー (cost-effective for high-volume production).
• ケーススタディ: A machinery maker used SAE 1112 for conveyor drive shafts. スチール 抗張力 処理 500 RPM operation, そしてその 加工性 cut production time by 25% vs. using SAE 1045. 後 3 年, the shafts showed no wear.

自動車

sae 1112 is a staple in automotive manufacturing for light-to-medium parts:

• 車軸: Small car axles or trailer axles (handles road vibrations and load).
• ドライブシャフト: Secondary drive shafts for compact cars (強度と重量のバランス).
• 送信コンポーネント: ギア, クリップ, and synchronizer parts (easy to machine into precise shapes).
• 例: An auto parts supplier used SAE 1112 トランスミッションギア用. スチール 硬度 resisted wear, そしてその 延性 allowed for tight tolerances—reducing gear noise by 15%.

工事

建設中, sae 1112 is used for light structural parts:

• 構造鋼コンポーネント: Non-load-bearing frames for sheds, garages, or small industrial buildings.
• ビーム そして 列: For lightweight structures like garden pavilions or tool sheds (not heavy high-rises).
• 例: A construction firm used SAE 1112 beams for a 150-square-meter garage. スチール 形成性 allowed for custom angles, そしてその 降伏強度 supported the roof’s weight. With a paint coat, the beams lasted 7 錆のない年.

パイプライン業界

sae 1112 works for low-to-medium pressure, small-diameter pipelines:

• Ideal for residential natural gas lines or irrigation pipes (not high-pressure oil/gas pipelines). その 延性 lets it be bent around corners, そしてその 強さ prevents leaks under moderate pressure.

海洋産業

For mild marine uses (not open ocean):

• 船の構造: Interior parts like storage locker frames or small brackets (not hulls—those need stainless steel).
• オフショアプラットフォーム: Temporary handrails or non-critical components (easy to replace if rusted).

農業機械

Farmers trust SAE 1112 for durable, 手頃な価格の部品:

• Tractor parts: ギアボックス, axle housings, and tool mounts (handles rough terrain and impacts).
• プラウ そして ハロー: Frame components or non-cutting parts (抵抗して土壌からの着用).
• 例: A farm equipment maker used SAE 1112 for plow frames. スチール 衝撃の靭性 withstood hitting rocks, and it cost 30% less than using HSLA steel.

3. Manufacturing Techniques for SAE 1112 構造鋼

sae 1112 is easy to manufacture—its chemical composition works with all standard steel processes. これが段階的な内訳です:

スチール製造プロセス

Two main methods produce SAE 1112, depending on volume:

1. 基本的な酸素炉 (bof): 大きなバッチに使用されます (例えば。, シート, バー, またはパイプ). Molten iron is mixed with manganese and sulfur, then oxygen is blown in to adjust carbon to 0.10–0.15%. Fast and cost-effective for bulk orders.
2. 電気弧炉 (EAF): Ideal for small batches or custom parts (例えば。, specialized gears). スクラップスチールは溶けています, and elements (Mn, s) are added to meet SAE 1112 仕様. Flexible for low-volume projects.

熱処理

sae 1112 rarely needs complex heat treatment, but these processes can enhance its properties:

• 正規化: 850〜900°Cに加熱します, 空気を冷やします. Softens the steel after rolling (makes it easier to stamp or machine).
• アニーリング: 800〜850°Cに加熱します, ゆっくりと冷却します. Makes the steel extra ductile for intricate shapes (例えば。, tiny transmission parts).
• クエンチングと焼き戻し: Rarely used—only for parts needing extra hardness (例えば。, 頑丈なギア).

プロセスの形成

sae 1112 excels in forming—its workability lets it be shaped into almost anything:

• ホットローリング: Heats to 1100–1200°C, rolls into bars, シート, またはパイプ (main method for basic SAE 1112 製品).
• コールドローリング: Rolls at room temperature. Creates smooth, 正確なシート (used for stamping small parts like clips).
• 鍛造: Heats steel and hammers it into thick parts (例えば。, tractor axles—enhances strength by aligning grain structure).
• 押し出し: Pushes heated steel through a die to make hollow parts (例えば。, small pipeline sections or gear housings).
• スタンピング: Uses high-pressure presses to cut or bend steel into shapes (例えば。, automotive brackets or washer blanks—fast for high-volume production).

表面処理

耐久性と耐食性を高めるため:

• 亜鉛メッキ: 溶融亜鉛に浸る. Ideal for outdoor parts (例えば。, garage beams or agricultural machinery)—lasts 15+ 錆のない年.
• 絵画: Applies epoxy or enamel paint. 屋内部品に使用されます (例えば。, machine housings) to prevent minor rust.
• ショットブラスト: Blasts with tiny metal balls to remove dirt, 規模, or rust. Prepares surfaces for welding or coating.
• コーティング: Uses fusion-bonded epoxy for pipelines (prevents corrosion in water or gas lines).

4. sae 1112 構造鋼Vs. その他の材料

How does SAE 1112 compare to other common steels and alloys? あなたが選ぶのを助けるためにそれを分解しましょう:

sae 1112 vs. 炭素鋼 (例えば。, sae 1005)

sae 1112 vs. 高強度の低合金 (HSLA) 鋼 (例えば。, X60)

• 化学組成: HSLA has alloys (Mn, で) for high strength; sae 1112 has no extra alloys (keeps cost low).
• プロパティ: HSLA is 2x stronger but hard to machine; sae 1112 is weaker but easier to shape.
• アプリケーション: HSLA = high-pressure pipelines, 橋; sae 1112 = automotive parts, 小さなシャフト.

sae 1112 vs. ステンレス鋼 (例えば。, 304)

sae 1112 vs. アルミニウム合金 (例えば。, 6061)

• 重さ: アルミニウムはです 1/3 ライター, but SAE 1112 は 30% 安く.
• 強さ: sae 1112 引張強度が高い (515–655 MPa vs. aluminum’s 310 MPA).
• アプリケーション: Aluminum = lightweight parts (自転車フレーム); sae 1112 = strength-focused parts (車軸, ギア).

5. Yigu Technology’s Perspective on SAE 1112 構造鋼

Yiguテクノロジーで, we see SAE 1112 as a “versatile mid-range solution” for clients balancing strength and workability. そのfree-machining trait cuts production time for mechanical parts, その間中程度の強さ works for automotive and light construction needs. We often recommend it to small manufacturers—its low cost and easy forming reduce project risks. 屋外で使用します, we pair it with galvanizing to boost corrosion resistance. sae 1112 isn’t for heavy loads, but for most mid-scale projects, it’s the most cost-effective choice.

FAQ About SAE 1112 構造鋼

1. Can SAE 1112 be used for high-pressure oil pipelines?

No—SAE 1112’s yield strength (310–440 MPa) is too low for high-pressure oil/gas (必要なもの 480+ MPA). Use HSLA steels like X60 or X70 for pipelines. sae 1112 works only for low-pressure lines (例えば。, residential gas).

2. Is SAE 1112 suitable for outdoor construction in rainy climates?

Yes—if you add a coating. Without protection, it will rust in 1–2 years. We recommend hot-dip galvanizing for outdoor parts like garage beams—it extends lifespan to 15+ 年, even in rainy areas.

3. Can SAE 1112 他の鋼に溶接してください (like SAE 1045)?

Yes—use low-hydrogen welding consumables (例えば。, E7018 electrodes) ひび割れを避けるため. Preheat SAE 1045 (the higher-carbon steel) to 150–200°C before welding, and let the joint cool slowly. This ensures a strong, durable bond.