30CrMoV9 QT Round Bar | 1.7707 Quenched and Tempered Alloy Steel
PRODUCT DESCRIPTION
30CrMoV9 / 1.7707 is a chromium-molybdenum-vanadium alloy steel evaluated for high-strength shafts, fasteners and heavy-duty machine components operating under load, impact and fatigue.MATERIAL INFORMATION
30CrMoV9 QT Round Bars | 1.7707
30CrMoV9, material number 1.7707, is a chromium-molybdenum-vanadium quenched-and-tempered alloy steel. It is used for demanding components where high strength, toughness, fatigue resistance and balanced mechanical properties through the section are required after appropriate quenching and tempering.
Saf Çelik evaluates 30CrMoV9 in round-bar form, supplied by lot either in quenched-and-tempered / QT condition or in a shearable annealed condition. Stock dimensions, delivery condition, mechanical properties and available certificates must be confirmed during quotation.
Important technical note: 30CrMoV9 / 1.7707 and 31CrMoV9 / 1.8519 are different materials. Their chemical composition, standards, heat-treatment response and hardenability may differ; therefore, they must not be marketed or accepted as automatic equivalents.
Principal Designations
| Item | Information |
|---|---|
| Steel grade | 30CrMoV9 |
| Material number | 1.7707 |
| Material family | Chromium-molybdenum-vanadium quenched-and-tempered alloy steel |
| Product form | Hot-rolled round bar |
| Delivery conditions | Quenched and tempered / QT or shearable annealed |
| Reference standards | DIN 17200-87; UNI EN 10250-3 references |
Chemical Composition: Grade Range
| Element | 30CrMoV9 / 1.7707 (%) |
|---|---|
| Carbon (C) | 0.26 – 0.34 |
| Silicon (Si) | max. 0.40 |
| Manganese (Mn) | 0.40 – 0.70 |
| Phosphorus (P) | max. 0.035 |
| Sulphur (S) | max. 0.035 |
| Chromium (Cr) | 2.30 – 2.70 |
| Molybdenum (Mo) | 0.15 – 0.25 |
| Nickel (Ni) | max. 0.60 |
| Vanadium (V) | 0.10 – 0.20 |
EN 10204 3.1 Certificate Heat-Analysis Examples
The values below are taken from original EN 10204 3.1 certificates for 30CrMoV9 / 1.7707 round-bar lots held in Saf Çelik records. They apply only to the relevant heat and must not be used as general certification values for all stock.
| Heat / lot | Delivery condition | C | Mn | Si | P | S | Cr | Ni | Mo | V |
|---|---|---|---|---|---|---|---|---|---|---|
| 053876 Ø220 mm |
Quenched and tempered | 0.286 | 0.52 | 0.23 | 0.012 | 0.004 | 2.43 | 0.19 | 0.19 | 0.126 |
| 022630 Ø180 mm |
Quenched and tempered | 0.310 | 0.54 | 0.27 | 0.011 | 0.001 | 2.43 | 0.14 | 0.19 | 0.130 |
| 456995 Ø200 mm |
Shearable annealed | 0.320 | 0.63 | 0.22 | 0.006 | 0.002 | 2.52 | 0.48 | 0.22 | 0.170 |
Mechanical Test Results from 3.1-Certified QT Lots
| Heat / lot | Diameter | Tensile strength Rm | Yield strength Rp0.2 | Elongation A5 | Reduction of area Z | Charpy-V at +20 °C |
|---|---|---|---|---|---|---|
| 053876 | Ø220 mm | 958 MPa | 863 MPa | 16.2% | 65% | 61 / 60 / 61 J |
| 022630 | Ø180 mm | 918 MPa | 809 MPa | 16.2% | 66% | 145 / 143 / 148 J |
Both QT certificates specified minimum requirements of 900–1100 MPa tensile strength, minimum 700 MPa yield strength, minimum 12% elongation, minimum 50% reduction of area and minimum 45 J Charpy-V impact energy at +20 °C. Both records also state 100% ultrasonic testing.
Reference Mechanical Properties
The following values are reference data for heat-treated open-die forgings and do not replace the certificate of an actual supplied lot.
| Section | Yield strength | Tensile strength | Elongation A5 | Charpy-V impact energy |
|---|---|---|---|---|
| ≤ 160 mm | ≥ 700 MPa | ≥ 900 MPa | ≥ 12% longitudinal / ≥ 8% transverse | ≥ 35 J longitudinal / ≥ 20 J transverse |
| 160 – 330 mm | ≥ 590 MPa | ≥ 800 MPa | ≥ 14% longitudinal / ≥ 10% transverse | ≥ 35 J longitudinal / ≥ 20 J transverse |
Machining, Heat Treatment and Welding
30CrMoV9 is more suitable for rough machining in the annealed condition. In QT condition, its high mechanical strength requires appropriate cutting tools, rigid clamping, controlled cutting parameters and sufficient coolant.
Heat-treatment results depend on section diameter, quenching medium, tempering temperature, holding time and starting microstructure. Therefore, mechanical values recorded on one certificate cannot automatically be guaranteed for a different diameter, heat or heat-treatment cycle.
Because of its alloy level and hardenability, welding must be carefully planned. Where welding is necessary, a qualified welding procedure, preheating, controlled cooling and, where required, post-weld heat treatment must be defined according to the actual material condition and service requirements.
Typical Applications
- Crankshafts and heavy-duty shafts
- High-strength bolts, studs and connection components
- Transmission and drive components
- Gearbox, press and heavy-machinery parts
- Special components exposed to high fatigue loading
- High-strength parts to be machined after forging
Availability and Certification Note
For 30CrMoV9 / 1.7707, stock diameter, length, delivery condition, certification, UT scope and mechanical values must be confirmed lot by lot. For QT material, the required minimum yield strength, tensile strength, impact value and test temperature should be specified in the enquiry.
For safety-critical, lifting, pressure or similarly high-responsibility applications, material selection must not be made until the applicable product standard, customer specification and available certification have been verified.