17 4 ステンレス丸棒

17 4 ステンレス丸棒

説明

17-4 ステンレス丸棒: 構成と性能特性

17-4 stainless steel round bar (also known as 17-4PH or AISI 630) is a precipitation-hardening martensitic stainless steel that combines high strength with good corrosion resistance. 航空宇宙分野で広く使用されています, 海洋, 石油化学, and precision engineering industries where both mechanical performance and dimensional stability are required.

などのオーステナイト系ステンレス鋼とは異なります。 304 または 316, 17-4 stainless steel achieves its strength through heat treatment (老化の過程), not only through alloy composition, making it suitable for high-load structural and mechanical components.

の化学組成 17-4 ステンレス鋼

のパフォーマンス 17-4 stainless steel round bar is mainly determined by its balanced chromium, ニッケル, and copper alloy system, along with a controlled carbon level and precipitation-hardening elements.

要素	代表的な内容 (%)	関数
クロム (Cr)	15.0 – 17.5	耐食性と酸化防止
ニッケル (で)	3.0 – 5.0	Stabilizes martensitic structure and toughness
銅 (銅)	3.0 – 5.0	Key element for precipitation hardening
ニオブ / Columbium (注意)	0.15 – 0.45	Strengthening and grain stabilization
炭素 (C)	≤ 0.07	硬度と溶接性を制御
マンガン (ん)	≤ 1.0	Improves toughness and hot working
シリコン (そして)	≤ 1.0	耐酸化性を高める
鉄 (鉄)	バランス	基本行列

の主なパフォーマンス特性 17-4 ステンレス丸棒

17-4 stainless steel is known for its exceptional strength-to-corrosion-resistance ratio, making it one of the most widely used precipitation-hardening stainless steels in engineering applications.

Very high tensile strength after heat treatment (エージング)
Good corrosion resistance in mild atmospheric and chemical environments
Excellent fatigue resistance under cyclic loading
Strong hardness stability with minimal deformation after processing
Good machinability in solution-annealed condition

Heat Treatment and Strength Development

機械的特性 17-4 stainless steel round bar are not fixed in its raw state. They are significantly improved through precipitation hardening (aging treatment), which forms fine copper-rich phases in the microstructure.

状態	熱処理	Performance Level
Solution Annealed (条件A)	1050℃ + rapid cooling	柔らかい, 良好な機械加工性
H900	Aging at ~480°C	Maximum strength and hardness
H1025–H1150	Aging at higher temperatures	バランスの取れた強度と靭性

耐食性挙動

その間 17-4 stainless steel offers good corrosion resistance, it is not as resistant as 316 stainless steel in chloride-rich environments. しかし, it performs well in general atmospheric, 工業用, and mildly corrosive conditions.

Good resistance to atmospheric corrosion
Moderate resistance in marine environments
Suitable for oil, ガス, and petrochemical conditions
Performance depends on heat treatment condition

Industrial Importance of Material Composition

The unique combination of chromium, ニッケル, and copper in 17-4 stainless steel round bar enables it to achieve both high strength and corrosion resistance. This balance is critical for precision components that must perform under high mechanical stress.

グローバルサプライチェーンにおいて, などのサプライヤー 泰達江華 provide controlled-composition stainless steel bars with stable heat-treatment performance, ensuring consistent quality for aerospace and industrial manufacturing.

Application-Driven Material Advantage

High-load mechanical components requiring strength and durability
Aerospace structural fittings and precision parts
Oil and gas valve and pump components
Marine engineering connectors and shafts
Industrial machinery requiring fatigue resistance

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