適切なエンジニアリング材料を選定することは、いかなる成功したCNC加工プロジェクトにおいても基礎となるものです。. EN 17CrNiMo6 is Case-hardening Cr-Ni-Mo alloy steel, and it is specified across demanding industries because its property profile matches real service loads. In this guide we examine its chemical composition, mechanical and physical properties, where it is used in production, and the practical parameters our machinists apply when cutting, drilling and finishing it on modern CNC equipment. Whether you are specifying raw stock or validating a design, the data below will help you make a confident, cost-effective decision.
Understanding EN 17CrNiMo6 also means understanding how it behaves once it leaves the saw and enters the spindle. The sections that follow move from metallurgy and chemistry to real machining advice, so you can plan tolerances, tooling and finishing in a single pass rather than discovering problems on the shop floor. For related processing topics, see our resources on 精密CNC加工 そして 旋削部品の材料選定.
We have machined EN 17CrNiMo6 in quantities ranging from single prototypes to full production runs, and the guidance here reflects that hands-on experience. Numbers are representative of the common supplied temper; always confirm critical values against a mill certificate for the exact heat you receive.
化学組成と合金化学
EN 17CrNiMo6 is Case-hardening Cr-Ni-Mo alloy steel. Its performance comes from a carefully balanced chemistry in which each element plays a specific role: major alloying elements build strength and hardenability, while minor additions refine the grain, improve machinability or stabilize the microstructure during heat treatment. The typical composition is shown in the table below, and we then explain what the most important elements do.
| 要素 | 典型的な含有量／範囲 |
|---|---|
| C | 0.15-0.20% |
| Si | <0.40% |
| Mn | 0.60-0.90% |
| Ni | 1.50-1.80% |
| Cr | 1.50-1.80% |
| Mo | 0.25-0.35% |
| Fe | 残り |
In EN 17CrNiMo6, C (typically 0.15-0.20%): carbon is the main hardening element, raising strength, hardness and wear resistance. Controlling this element within tight limits is what lets mills deliver repeatable, specification-grade stock.
In EN 17CrNiMo6, Si (typically <0.40%): silicon improves fluidity in cast forms and, together with magnesium, can form strengthening intermetallic phases. Controlling this element within tight limits is what lets mills deliver repeatable, specification-grade stock.
In EN 17CrNiMo6, Mn (typically 0.60-0.90%): manganese refines the grain, improves hot strength and helps control the as-cast or as-rolled structure. Controlling this element within tight limits is what lets mills deliver repeatable, specification-grade stock.
In EN 17CrNiMo6, Ni (typically 1.50-1.80%): nickel improves high-temperature stability, hardenability and through-thickness uniformity. Controlling this element within tight limits is what lets mills deliver repeatable, specification-grade stock.
In EN 17CrNiMo6, Cr (typically 1.50-1.80%): chromium boosts hardenability, temper resistance and corrosion behaviour. Controlling this element within tight limits is what lets mills deliver repeatable, specification-grade stock.
In EN 17CrNiMo6, Mo (typically 0.25-0.35%): molybdenum deepens hardening, improves high-temperature strength and raises creep resistance. Controlling this element within tight limits is what lets mills deliver repeatable, specification-grade stock.
In EN 17CrNiMo6, Fe (typically balance): iron is a controlled impurity that is kept low so it does not harm ductility and corrosion resistance. Controlling this element within tight limits is what lets mills deliver repeatable, specification-grade stock.
生産工程では、組成をスペクトロメトリーにより確認し、その結果は材料証明書に記載されます。微小な変動が焼入れ性や耐食性、さらには切削工具に対する応答特性に影響を及ぼすため、最初の棒材を投入する前に必ず熱処理証明書と工程計画を照合しています。.
機械的特性
Mechanical properties define how EN 17CrNiMo6 carries load, resists deformation and survives fatigue in service. The values quoted here are representative of the common supplied temper; heat treatment and section size will move the numbers, so confirm with your mill certificate for critical parts. The summary table is followed by notes on why each value matters to a designer.
| 機械的特性 | 典型的値 |
|---|---|
| 引張強度 | core 800-1000 MPa (case hardened) |
| 降伏強度 | core 600-750 MPa |
| 伸び率 | 10-15% |
| 硬度 | case 58-62 HRC, core 230-300 HB |
引張強度および降伏強度は、構造部品が耐えられる荷重を示し、伸び率は過剰荷重の吸収や成形時の変形許容能力を表します。硬度は摩耗耐性の有力な指標であり、加工時の工具摩耗の予測にも役立ちます。これらの諸数値を総合することで、断面寸法の選定や安全率の決定、検査基準の設定を自信を持って行うことができます。.
For load-bearing designs, the yield strength and elongation together tell you how much margin exists before permanent set and how much ductility remains to absorb overload. EN 17CrNiMo6 offers a balance that suits structural and dynamic applications where both stiffness and toughness matter, which is why it keeps appearing in airframes, drivetrains and rotating equipment.
物理的・熱的特性
Physical properties affect machining strategy as much as mechanical ones. Density drives mass and handling, thermal conductivity governs how heat leaves the cut, and the melting or softening point sets the ceiling for cutting speed and the type of coolant you can use. The table below summarizes the key values for EN 17CrNiMo6.
| 物理的特性 | 典型的値 |
|---|---|
| 密度 | 7.85 g/cm³ |
| 融点 | 1430～1490℃ |
| 熱伝導率 | 38 W/m・K |
| 電気的特性 | 9% IACS |
These values explain why EN 17CrNiMo6 machines the way it does. Low thermal conductivity, for example, traps heat at the tool edge and pushes you toward sharper tools, lower depths of cut and aggressive coolant delivery. A low or high density changes how you fixture and balance a part. High strength-to-weight ratios, on the other hand, are exactly why designers keep specifying this material even when a cheaper alternative exists.
主要な特性
EN 17CrNiMo6 earns its place in engineering designs because of a short list of characteristics that matter on the shop floor and in the field. Each one is explained below so you can judge fit against your requirement.
Molybdenum improves hardenability and temper resistance
Molybdenum improves hardenability and temper resistance In the context of EN 17CrNiMo6, this matters because it influences both the performance of the finished part and the way the raw stock must be processed, heat treated and machined to release its full potential.
Excellent toughness at the core
Excellent toughness at the core In the context of EN 17CrNiMo6, this matters because it influences both the performance of the finished part and the way the raw stock must be processed, heat treated and machined to release its full potential.
High fatigue strength for big gears
High fatigue strength for big gears In the context of EN 17CrNiMo6, this matters because it influences both the performance of the finished part and the way the raw stock must be processed, heat treated and machined to release its full potential.
Stable in heavy service
Stable in heavy service In the context of EN 17CrNiMo6, this matters because it influences both the performance of the finished part and the way the raw stock must be processed, heat treated and machined to release its full potential.
Together these traits make EN 17CrNiMo6 a practical choice where performance, weight and manufacturability must all be satisfied at once. None of them is unique on its own, but the combination is what separates a specification-grade material from a commodity one.
工業およびエンジニアリング用途
The real test of any material is where it is trusted in production. EN 17CrNiMo6 appears across aerospace, automotive, energy and precision industries in the following roles, each chosen because the property profile matches the duty cycle:
Heavy vehicle gears
Truck and off-highway transmission gears.
When we produce heavy vehicle gears for this kind of application, we pay particular attention to the critical dimensions and surface condition, because that is what determines whether the part survives its service life. Our inspection reports document every key feature.
Ring gears
Large carburized ring and pinion sets.
When we produce ring gears for this kind of application, we pay particular attention to the critical dimensions and surface condition, because that is what determines whether the part survives its service life. Our inspection reports document every key feature.
シャフトおよび軸
High-torque driveline parts.
When we produce shafts and axles for this kind of application, we pay particular attention to the critical dimensions and surface condition, because that is what determines whether the part survives its service life. Our inspection reports document every key feature.
Wind turbine components
Carburized gear teeth in drives.
When we produce wind turbine components for this kind of application, we pay particular attention to the critical dimensions and surface condition, because that is what determines whether the part survives its service life. Our inspection reports document every key feature.
こうした部品の固定・治具に関する背景については、当社の以下の備考をご参照ください。 CNCフライス加工向けの治具設計 そして 組立時の公差積み上げ. 優れた治具の選定は、公差を満たす部品とそうでない部品との差を生むことがしばしばあります。.
CNC加工ガイドライン
Machining EN 17CrNiMo6 successfully is about matching tooling, speed and coolant to its specific behaviour. The recommendations below reflect shop-proven practice for holding dimension, surface finish and tool life, and they are a starting point that our programmers refine for each geometry.
金型選定
Carbide; machine soft before heat treat.
材種だけでなく、工具の幾何学形状も重要です。高い正のリーフ角は切削抵抗を低減し、研磨済みのフルートは粘り気のある切りくずの排出を助け、剛性の高い工具ホルダーは、表面仕上げを損なう振動を抑制します。当社では、汎用エンドミルを使用せず、各工程に応じて最適な形状を選定しています。.
切削条件
Turning 55-110 m/min annealed.
これらの加工範囲は、剛性の高い工作機械と十分に固定された部品を前提としています。チッピングが発生した場合には、単に送り速度を落とすのではなく、まず工具のオーバーハングを短くし、主軸回転数を上げて安定したローブ領域へ移行することが第一の対処法です。当社の各工場では、材料ごとに実績のある加工パラメータを記録しており、再び同じ加工を行う際には既知の良好な条件から開始できるようになっています。.
公差と表面仕上げ
Rough +/-0.05 mm pre-heat; grind to +/-0.01 mm.
ワークホルディングおよび治具
Stable workholding is the quiet hero of precision machining. For EN 17CrNiMo6 we favour full-contact soft jaws, vacuum or dedicated fixtures that constrain the part without distorting it, then measure the first piece before releasing the batch. This discipline is what lets us hold the tight tolerances the application demands.
Common challenges when cutting EN 17CrNiMo6: Machine soft, carburize, grind; molybdenum raises tempering need.. A rigid setup, sharp edges and consistent coolant delivery resolve most of them, and our quality team verifies every critical dimension before shipment so the part that reaches your dock is the part on the drawing.
熱処理と表面仕上げ
Carburize 900-920 C, quench, double temper for tough core and hard case.
After thermal treatment, EN 17CrNiMo6 is usually finished by grinding, honing or light CNC cleanup to reach the final tolerance, because hardened material is too hard to cut economically. Surface treatments such as anodizing, plating, nitriding, black oxide or coating can then be added when wear, corrosion or appearance call for it. We coordinate heat treatment and finishing with machining so distortion is planned for, not discovered late.
How EN 17CrNiMo6 Compares with Similar Materials
No material is chosen in isolation. The table below positions EN 17CrNiMo6 against nearby alternatives so you can see where it wins and where a substitute might be better. The right choice is almost always a trade-off between cost, weight, strength and how easily the part can be made.
| 同等材料 | 違いの理由／選択すべきタイミング |
|---|---|
| EN 18CrNiMo7-6 | 18CrNiMo7-6 is the slightly higher-alloy sibling. |
| EN 16MnCr5 | 16MnCr5 is cheaper but less tough for heavy loads. |
もし最低限の重量、最高の強度、あるいは最も容易な加工を優先するのであれば、この表における適切な近隣材料が意思決定を左右する可能性があります。当社のエンジニアは、お客様の荷重や数量に基づいた簡易な比較検討を行えます。合金や熱処理条件をわずかに変更するだけで、高コストな二次加工工程を省けることもよくあります。.
Tuofa CNC Germany：あなたの精密加工パートナー
設計が完成した際、, Tuofa CNCドイツ turns materials like EN 17CrNiMo6 into finished, inspected components. We are a precision CNC machining supplier serving automotive, aerospace, medical and industrial customers who need consistent quality and short lead times, and we treat every order as a partnership rather than a transaction.
エンジニアがTuofa CNC Germanyを選ぶ理由
ISO規格に準拠したプロセス、熟練したプログラマー、透明性の高い見積りワークフローを組み合わせることで、最初の切削を行う前に必ず納品内容をご理解いただけます。単一の試作から量産まで、同一の品質管理体制を適用しており、試作品と量産品で異なる挙動が生じるリスクを排除しています。.
当社のCNC加工能力
Our workshop runs 3-, 4- and 5-axis CNC milling centers, CNC turning lathes with live tooling, and support processes such as grinding, deburring and inspection. We routinely hold tight tolerances on metals, plastics and specialty alloys like EN 17CrNiMo6, and our CAD/CAM team optimizes toolpaths for both cycle time and surface quality.
当社が取り扱う材料と公差
Beyond EN 17CrNiMo6, we machine aluminum, stainless and alloy steels, titanium, copper alloys, PEEK and other engineering polymers. Typical tolerances reach +/-0.01 mm on critical features, with full material traceability and first-article inspection on request. Get a quote through our CNC加工サービス ページ、または迅速で詳細な回答のために図面をお送りください。.
結論
EN 17CrNiMo6 is Case-hardening Cr-Ni-Mo alloy steel, valued for its balanced combination of properties and proven track record in demanding applications. With the right composition, heat treatment and CNC parameters, it delivers reliable, repeatable parts that hold up in the field. Tuofa CNC Germany is ready to machine it to your drawing and tolerance, with the inspection and traceability your program requires. Reach out today to discuss your project and receive a fast, detailed quotation.