# 30CrMoV9 Forgings (W.-Nr. 1.7707) Cr-Mo-V alloy special steel to EN 10250-3, supplied as forged bars, hollow bars, seamless rolled rings, discs, blocks and shafts. **Source page:** https://www.steelforgepieces.com/Alloy-Steel/30CrMoV9.html **Supplier:** Jiangyin Jiangnan Metal Co., Ltd., open-die forging factory, Jiangyin, Jiangsu, China **Last reviewed:** 10 September 2026 --- ## Summary 30CrMoV9 (W.-Nr. 1.7707) is a chromium-molybdenum-vanadium alloy special steel listed in EN 10250-3 for open-die forgings. The composition is 0.26 to 0.34 % C, 2.30 to 2.70 % Cr, 0.15 to 0.25 % Mo and 0.10 to 0.20 % V. Quenched and tempered, it gives a minimum 900 MPa tensile strength and 700 MPa yield strength up to 160 mm section thickness. Nitriding raises the surface to about 800 HV1. Jiangyin Jiangnan Metal Co., Ltd. forges this grade to customer drawings as bars, hollow bars and cylinders, seamless rolled rings, discs and blocks, and crankshafts, gear shafts and spindles, in piece weights of 20 kg to 20,000 kg. Minimum order is one piece and an EN 10204 3.1 certificate is supplied as standard. Send a drawing to sales@steelforgepieces.com or call +86 189 2135 9659 for a quotation within 24 hours. --- ## Key facts and supply data | Item | Detail | |---|---| | Grade designation | 30CrMoV9, also written 30 CrMoV 9 | | EN material number | 1.7707 | | Governing standard | EN 10250-3, open steel die forgings for general engineering purposes, alloy special steels | | Steel type | Chromium-molybdenum-vanadium alloy special steel, deep hardening, frequently nitrided | | Nearest relatives | 31CrMoV9 / 1.8519 (EN 10085 nitriding steel), GOST 30Kh3MF | | Delivery conditions | Quenched and tempered (+QT), normalised (+N), soft annealed (+A), or as forged | | Melting route | EAF + LF + VD (vacuum degassed). ESR available on request | | Unit weight | 20 kg to 20,000 kg per piece | | Minimum order | 1 piece, including prototypes and single spares | | Typical lead time | 15 to 35 days after drawing approval | | Certification | EN 10204 3.1 as standard. 3.2 witnessed by SGS, BV, TUV, Lloyd's Register or ABS on request | | Loading ports | Shanghai or Ningbo, China | | Quotation time | Within 24 hours of receiving a drawing or dimension list | --- ## Chemical composition EN 10250-3 specifies 0.26 to 0.34 % carbon, 2.30 to 2.70 % chromium, 0.15 to 0.25 % molybdenum and 0.10 to 0.20 % vanadium, balance iron. Chromium is about two and a half times the level found in 42CrMo4. That is the main reason the grade hardens through in heavy sections and responds well to nitriding. Ladle analysis, % by mass: | C | Si | Mn | P | S | Cr | Mo | Ni | V | |---|---|---|---|---|---|---|---|---| | 0.26-0.34 | max 0.40 | 0.40-0.70 | max 0.035 | max 0.035 | 2.30-2.70 | 0.15-0.25 | max 0.60 | 0.10-0.20 | Product analysis tolerances apply per the standard. Tighter internal limits can be agreed at order, for example P and S held to max 0.025 % for pressure or low-temperature service. --- ## Mechanical properties, quenched and tempered (+QT) In the quenched and tempered condition EN 10250-3 requires at least 900 MPa tensile strength and 700 MPa yield strength for sections up to 160 mm. Between 160 mm and 330 mm the minimums drop to 800 MPa and 590 MPa, because the quench cannot cool the core as quickly. | Property | Section up to 160 mm | Section 160 to 330 mm | |---|---|---| | Tensile strength Rm | >=900 MPa | >=800 MPa | | Yield strength ReH | >=700 MPa | >=590 MPa | | Elongation A, longitudinal | >=12 % | >=12 % | | Elongation A, transverse | >=8 to 10 % | >=8 to 10 % | | Hardness, normal range | 270-330 HB | 250-300 HB | | Modulus of elasticity | approx. 210 GPa | approx. 210 GPa | | Density | 7.85 g/cm3 | 7.85 g/cm3 | Hardness, modulus and density are working values for the quenched and tempered condition, not standard requirements. Impact energy, elevated-temperature properties and through-thickness testing are agreed per order. Section thickness governs the properties that can be specified. A 500 mm forged shaft in 30CrMoV9 will not reach the values quoted for a 150 mm bar. State the finished section thickness in the enquiry and we will confirm achievable values before the order is placed. --- ## Heat treatment 30CrMoV9 is hardened from 840 to 880 degC with an oil quench and tempered at 570 to 680 degC to set the final strength. Soft annealing at 680 to 720 degC brings hardness down to about 248 HB for machining. Normalising is done at 860 to 900 degC. | Operation | Temperature | Cooling and result | |---|---|---| | Normalising | 860-900 degC | Still air. Refines grain after forging | | Soft annealing | 680-720 degC | Slow furnace cool. Max approx. 248 HB | | Hardening (austenitising) | 840-880 degC | Oil quench. Water only for specific sections after agreement | | Tempering | 570-680 degC | Air or oil. Higher temperature lowers strength and raises toughness | | Stress relieving | 550-600 degC | Slow cool. Keep at least 30 degC below the tempering temperature | | Nitriding | 500-580 degC | Gas, plasma or salt bath. Surface up to approx. 800 HV1 | ### Recommended nitriding sequence 1. Forge and normalise, then rough machine with stock left for distortion. 2. Quench and temper, with the tempering temperature at least 30 degC above the planned nitriding temperature so the core does not soften later. 3. Stress relieve after rough machining if the part is long, thin or asymmetric. 4. Finish machine to final dimensions, leaving grinding stock only. 5. Nitride at 500 to 580 degC to the specified case depth, then grind the sealing or bearing surfaces. Case depth for this grade is normally specified between 0.3 mm and 0.6 mm. Deeper cases need longer cycles and should be agreed with the nitriding shop before machining allowances are fixed. --- ## Forged product forms and sizes 30CrMoV9 is open-die forged into five groups of shape: solid bars, hollow bodies, seamless rolled rings, discs and blocks, and shafts. All work is made to drawing, so non-standard sizes and single pieces are routine. | Form | Size range | Where it is used | |---|---|---| | Round, square, flat and hex bars | 80 to 1200 mm dia. or across flats, up to 8000 mm long | Machining stock for pins, rams, valve stems, tie rods | | Hollow bars, sleeves, bushings, cylinders, casings, shells | 150 to 2500 mm OD, bore from 60 mm, wall from 25 mm | Hydraulic cylinders, extruder barrels, bearing housings, pump casings | | Seamless rolled rings and forged rings | 200 to 4000 mm OD, height up to 800 mm | Gear rims, bearing races, flanges, slewing ring blanks | | Discs, blocks and plates | Discs up to 2500 mm dia., blocks up to 800 mm thick | Tube sheets, die blocks, valve bodies, press platens | | Crankshafts, gear shafts, pinion shafts, spindles, ring gears, gear wheels | Up to 8000 mm long, up to 20,000 kg per piece | Gearboxes, compressors, marine and power transmission | The size envelope reflects our normal open-die and ring-rolling capacity. Machining allowance, forging ratio and grain-flow requirements are set from the drawing. Rough machined, semi-finished and finish machined deliveries are all available. --- ## Applications 30CrMoV9 is chosen for medium and large cross-sections that need a hard, wear-resistant surface over a tough core and that also have to hold their strength at moderately elevated temperature. - Valves and fittings: gate valve bodies, stems and superheated steam fittings, where creep resistance and tempering stability matter. - Power transmission: pinion shafts, gear blanks and spindles nitrided for surface durability after quenching and tempering. - Plastics and rubber machinery: extruder screws, barrels and liners relying on the nitrided case for abrasion resistance. - Engine and compressor parts: cylinders, crankshafts and connecting components in medium and large cross-section. - Oil, gas and general engineering: high-strength studs, tie rods, mandrels and tooling that must resist softening in service. --- ## Comparison with similar grades The grade closest to 30CrMoV9 is 31CrMoV9 (1.8519), which has nearly identical chemistry but sits in the nitriding steel standard EN 10085. 42CrMo4 is the cheaper general-purpose choice with about a fifth of the chromium. 34CrNiMo6 is the nickel-bearing grade used where core toughness in very heavy sections is the priority. | Grade | Number | Cr / Mo / V, % | Standard | Chosen when | |---|---|---|---|---| | 30CrMoV9 | 1.7707 | 2.30-2.70 / 0.15-0.25 / 0.10-0.20 | EN 10250-3 | A hard nitrided surface is needed over a tough core, stable at elevated temperature | | 31CrMoV9 | 1.8519 | 2.30-2.70 / 0.15-0.25 / 0.10-0.20 | EN 10085 | The drawing specifically calls out a nitriding steel | | 42CrMo4 | 1.7225 | 0.90-1.20 / 0.15-0.30 / none | EN 10083-3 | General quenched and tempered duty at lower cost and easier machining | | 34CrNiMo6 | 1.6582 | 1.30-1.70 / 0.15-0.30 / none, Ni 1.30-1.70 | EN 10083-3 | Maximum core toughness in very heavy shafts and high-impact duty | 30CrMoV9 is not AISI 4140 or AISI 4340. Some cross-reference tables print 4340 next to 1.7707, but chromium in 30CrMoV9 is around three times higher and there is no deliberate nickel addition. Those tables are a starting point for discussion, not an approved substitution. --- ## Testing and certification Every 30CrMoV9 order ships with an EN 10204 3.1 inspection certificate showing the heat number, ladle analysis, heat-treatment record and mechanical test results. Standard on every order: - Ladle chemical analysis by spectrometer, reported element by element. - Tensile test (Rm, ReH, A, Z) on a test bar heat treated with the production forging. - Brinell hardness readings at the positions shown on the drawing. - Heat-treatment charts with furnace numbers, soak times and quench media. - Dimensional inspection report against the approved drawing. - EN 10204 3.1 certificate signed by our authorised inspection representative. Available on request: - Ultrasonic testing to EN 10228-3 or SEP 1921, with the acceptance class stated on the order. - Magnetic particle testing to EN 10228-1 for surface indications. - Charpy V-notch impact testing, including sub-zero temperatures. - Grain size, macro-etch and microstructure examination with photographs. - Jominy hardenability testing and hardness traverse through the section. - EN 10204 3.2 certification witnessed by SGS, BV, TUV, Lloyd's Register, ABS or DNV. - PMI verification, marking and heat-number traceability photographs before shipment. --- ## How to order Send a drawing, or the rough dimensions, to sales@steelforgepieces.com. A complete enquiry is normally answered with a firm price and lead time within 24 hours. What to include in the enquiry: 1. Grade and standard: 30CrMoV9, 1.7707, or the customer specification that governs. 2. Shape and dimensions: drawing in PDF or STEP, or outside diameter, bore, length and thickness. 3. Quantity and expected repeat volume, so the ingot or billet cut can be planned. 4. Delivery condition: as forged, normalised, annealed, or quenched and tempered to a target hardness. 5. Machining state: black forged, rough machined with allowance, or finish machined. 6. Testing and certificates: EN 10204 3.1 or 3.2, ultrasonic class, impact temperature, any third-party inspector. 7. Destination port and required delivery date. --- ## Frequently asked questions **Is 30CrMoV9 the same as 1.7707?** Yes. 30CrMoV9 is the EN chemical designation and 1.7707 is the EN material number for the same steel. Drawings may show either, or both together as 30CrMoV9 / 1.7707. **Which standard covers 30CrMoV9 forgings?** EN 10250-3, open steel die forgings for general engineering purposes, part 3: alloy special steels. It sets the composition and the quenched and tempered mechanical properties for section thicknesses up to 330 mm. **Is 30CrMoV9 the same as 31CrMoV9 (1.8519)?** No, though the chemistry is almost identical. 30CrMoV9 sits in EN 10250-3 as an alloy special steel for forgings. 31CrMoV9 sits in EN 10085 as a dedicated nitriding steel. If the drawing says 31CrMoV9, supply 31CrMoV9. The two are not interchangeable without written approval from the customer. **What is the American equivalent of 30CrMoV9?** There is no exact AISI or SAE equivalent. The chromium content is far above AISI 4140 and 4340, so neither is a drop-in substitute. The closest listed cross-reference is the GOST grade 30Kh3MF, and the nearest EN relative is 31CrMoV9 (1.8519). **Can 30CrMoV9 be nitrided, and how hard does the surface get?** Yes. Chromium, molybdenum and vanadium form stable nitrides, so gas, plasma or salt-bath nitriding at roughly 500 to 580 degC produces a surface of up to about 800 HV1 over a quenched and tempered core. Temper above the nitriding temperature and finish machine before nitriding. **Is 30CrMoV9 weldable?** It has a high carbon equivalent and is not recommended for welded structures. If welding cannot be avoided, use low-hydrogen consumables, preheat to about 250 to 350 degC, hold the interpass temperature and apply post-weld heat treatment below the tempering temperature, then qualify the procedure by test. **How machinable is 30CrMoV9?** In the soft annealed condition at around 248 HB it machines much like other medium-carbon alloy steels. Above 300 HB after quenching and tempering, tool life drops. Carbide tooling, rigid setups and roughing before final heat treatment all help. **What sizes and weights can you forge in 30CrMoV9?** From about 20 kg to 20,000 kg per piece: bars 80 to 1200 mm diameter, seamless rolled rings 200 to 4000 mm outside diameter, discs and blocks up to about 2500 mm, and shafts up to about 8000 mm long. **What is the minimum order quantity and the lead time?** Minimum order is one piece, including single spares and prototypes. Lead time is normally 15 to 35 days after drawing approval, depending on size, heat treatment and the testing requested. **Do you supply material certificates?** Yes. EN 10204 3.1 is standard on every order. EN 10204 3.2 with SGS, BV, TUV, Lloyd's Register or ABS witnessing is available on request. **Which countries do you export 30CrMoV9 forgings to?** We ship worldwide from Shanghai and Ningbo, regularly to Germany, Italy, Turkey, India, the United States, Brazil, Korea and Southeast Asia, on FOB, CIF or DDP terms. **How do I get a quotation?** Email the drawing or dimensions with quantity, delivery condition and test requirements to sales@steelforgepieces.com, or call +86 189 2135 9659. Quotations normally come back within 24 hours, in English, with price, weight, lead time and the certificate package listed separately. --- ## Standards referenced - EN 10250-3, open steel die forgings for general engineering purposes, part 3: alloy special steels. - EN 10085, nitriding steels, technical delivery conditions. Covers 31CrMoV9 (1.8519). - EN 10083-3, steels for quenching and tempering, alloy steels. Covers 42CrMo4 and 34CrNiMo6. - EN 10204, metallic products, types of inspection documents. - EN 10228-1 and EN 10228-3, non-destructive testing of steel forgings. - SEP 1921, German ultrasonic acceptance classes for forged bars and discs. Composition and property values were cross-checked against the European steel grade database at steelnumber.com. Standards are revised periodically. For contractual work, verify against the current published edition. --- ## Contact **Jiangyin Jiangnan Metal Co., Ltd.** Open-die forging factory - Address: No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China - Phone, WhatsApp and WeChat: +86 189 2135 9659 - Email: sales@steelforgepieces.com - Website: https://www.steelforgepieces.com/ - Business hours: Monday to Saturday, 08:00 to 18:00 China Standard Time (UTC+8) - Response time: quotations within 24 hours, technical replies the same working day Related grades: [42CrMo4](https://www.steelforgepieces.com/Alloy-Steel/42CrMo4.html), [AISI 4140](https://www.steelforgepieces.com/Alloy-Steel/AISI-4140.html), [34CrNiMo6](https://www.steelforgepieces.com/Alloy-Steel/34CrNiMo6.html), [AISI 4340](https://www.steelforgepieces.com/Alloy-Steel/AISI-4340.html), [18CrNiMo7-6](https://www.steelforgepieces.com/Alloy-Steel/18CrNiMo7-6.html), [all alloy steel grades](https://www.steelforgepieces.com/Alloy-Steel/).