Excerpt:
Chromium-molybdenum quench-and-temper steel for drive shafts, pins, gear blanks and higher-load mechanical components. Ruling section and heat-treatment condition determine strength and toughness; define heat treatment and inspection especially for large diameters.
QIDA METAL · PRODUCT PROCUREMENT GUIDE
42CrMo4 Alloy Round Bar
Chromium-molybdenum quench-and-temper steel for drive shafts, pins, gear blanks and higher-load mechanical components. Ruling section and heat-treatment condition determine strength and toughness; define heat treatment and inspection especially for large diameters.
| Procurement Item | Details |
|---|---|
| Applicable Standard | EN ISO 683-2 / 42CrMo4（1.7225） |
| Product Category | Steel Sections & Bars / Round Bar |
| Dimensions & Quantity | The sizes below are enquiry references. Available combinations, quantities and delivery times are subject to written quotation. |
| Documentation | Specify heat/batch inspection documents, standard edition, traceability and project certification in your enquiry. Documents are subject to confirmation of actual availability. |
01 / Product Features & Selection
- +QT reference properties are grouped by ruling diameter to avoid applying small-section properties to large bars.
- Review annealed-for-machining and quenched-and-tempered supply routes separately.
- Include UT, hardness distribution, machining allowance and heat-treatment records in the enquiry.
02 / Specifications, Dimensions & Ordering Options
These dimensions help define your purchase requirement; they do not imply that every combination is in stock. Specify tolerances, quantity, delivery condition and destination port. Submit drawings for special sizes.
| Parameter | Specification / Enquiry Range | Points to Confirm |
|---|---|---|
| Diameter d / mm | 10, 12, 14, 16, 18, 20, 22, 25, 28, 30, 32, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 90, 100, 110, 120, 130, 140, 150, 160, 180, 200, 220, 250 | Enquiry diameter series; confirm diameter combinations with heat-treatment and surface condition. |
| Length / m | 3, 6 or sawn fixed lengths | For short pieces, specify saw cut, tolerance and machining allowance. |
| Dimensions & Surface | Hot rolled, turned, ground or cold-drawn requirements | Use the appropriate dimensional tolerance standard for hot rolled and bright finished bars. |
| Ordering Tolerances | Diameter tolerance, ovality, straightness and surface-defect depth | Precision fits require explicit tolerances. |
| Delivery Condition | +AR as rolled, +A soft annealed or +QT quenched and tempered, as ordered | The property table is a +QT reference; other conditions do not automatically achieve these values. |
Round Bar Theoretical Weight & Shipping Estimates
Using a typical density of 7.85 g/cm³: theoretical mass per metre = π÷4×d²×7.85÷1000, with d in mm. Values support procurement estimates; actual weighing, diameter tolerances, peeling and cut-length losses follow the agreed settlement basis.
| Diameter d / mm | Theoretical kg/m | Theoretical kg / 6 m Bar |
|---|---|---|
| 10 | 0.62 | 3.70 |
| 12 | 0.89 | 5.33 |
| 16 | 1.58 | 9.47 |
| 20 | 2.47 | 14.80 |
| 25 | 3.85 | 23.12 |
| 30 | 5.55 | 33.29 |
| 40 | 9.86 | 59.19 |
| 50 | 15.41 | 92.48 |
| 60 | 22.20 | 133.17 |
| 80 | 39.46 | 236.75 |
| 100 | 61.65 | 369.92 |
| 120 | 88.78 | 532.69 |
| 150 | 138.72 | 832.33 |
| 180 | 199.76 | 1198.55 |
| 200 | 246.62 | 1479.69 |
| 250 | 385.34 | 2312.02 |
03 / Standard Chemical Composition
EN ISO 683-2 / 42CrMo4（1.7225）. Values are mass percentages (%). Maximum limits are shown by ≤, minimum limits by ≥; ranges are specification limits and Fe is the balance. These are not measured results for a current delivery heat.
| Element / Indicator | Requirement or Range |
|---|---|
| C | 0.38–0.45 |
| Si | 0.10–0.40 |
| Mn | 0.60–0.90 |
| P | ≤0.025 |
| S | ≤0.035 |
| Cr | 0.90–1.20 |
| Mo | 0.15–0.30 |
| Fe | Balance |
Standard heat analysis, mass %, using the Ovako EN ISO 683-2 row. SAE 4140 is a similar grade but requires verification before dual certification.
04 / Mechanical Properties & Application Limits
| Thickness / Material Condition | Yield Strength Re / Rp0.2 (MPa) | Tensile Strength Rm (MPa) | Elongation After Fracture A (%) |
|---|---|---|---|
| +QT，d≤16 mm | ≥900 | 1100–1300 | ≥10 |
| +QT，16<d≤40 mm | ≥750 | 1000–1200 | ≥11 |
| +QT，40<d≤100 mm | ≥650 | 900–1100 | ≥12 |
| +QT，100<d≤160 mm | ≥550 | 800–950 | ≥13 |
| +QT，160<d≤250 mm | ≥500 | 750–900 | ≥14 |
Strength in MPa, A5 in %, from Saarstahl public +QT size groups. Do not apply to +AR or +A material. Acceptance depends on ruling section, specimen direction, heat treatment and contractual edition. Saarstahl reference hardness maxima: +A 241 HB; +S shearability-treated condition 255 HB.
05 / Inspection, Processing & Quality Checks
- Verify 42CrMo4 and standard edition. SAE 4140 or 42CrMoS4 substitution requires technical review.
- Match ruling section, sampling position and heat-treatment batch to the required mechanical properties.
- Specify UT class, hardness, impact direction and temperature for the application. Surface hardness does not establish all core properties.
- High-strength steel welding and surface hardening require dedicated procedures, qualification and post-treatment verification where applicable.
06 / Export Packaging for This Product
| Stage | Recommended Arrangement | Key Considerations |
|---|---|---|
| Section-Separated Bundles | Identify section designation, steel grade, length and heat number separately. | Keep different grades and delivery conditions in separate bundles. |
| Supports & Corner Protection | Protect flanges, leg edges and machined faces; support long sections at multiple points. | Prevent handling twist, local damage and permanent bending. |
| Loading Checks | Plan loading around cut length, bundle weight, forklift points and container-door clearance. | Assess container type and handling arrangements in advance for long or heavy loads. |
Before shipment, cross-check product, grade, heat number, size, piece count, net weight and gross weight against the packing list. Match labels to inspection documents. For solid-wood pallets, dunnage or crates, check destination-country rules; wood subject to ISPM 15 must be treated and marked by an approved provider. Load dry cargo and arrange supports, blocking and securing according to weight and centre of gravity.
07 / How Qida Supports Your Procurement
| Procurement Stage | Qida Coordination | Information for the Buyer |
|---|---|---|
| Requirement Review | Review application, standards, material condition, drawings and acceptance items. | A checkable specification list helps reduce language and unit-conversion errors. |
| Order Confirmation | Confirm material, processing, inspection, packaging, delivery milestones and cost responsibilities item by item. | A clear written quotation and mutually agreed purchase requirements. |
| Delivery Coordination | Coordinate production / sourcing progress, labels, packing lists and shipping documents. | Check dimensions, quantities and heat/batch correspondence at agreed milestones. |
| After-Sales Follow-Up | Review issues using order number, heat number, arrival photographs and test records. | A defined issue description and documented resolution communications. |
Qida focuses on clear specifications, material requirement checks and delivery coordination. Include cutting, cut-to-length, surface treatment, third-party inspection and certificate requirements in your enquiry so that the achievable scope can be agreed before order placement.
08 / Request for Quotation
For an accurate quotation, please provide:
42CrMo4 / standard edition + diameter × length / quantity + +A or +QT + strength / hardness / impact + UT class + surface allowance + destination port. Include project specifications and inspection plans.
Define Specifications, Quality and Delivery in One Enquiry
Send your purchasing list to Shandong Qida Metal Technology Co., Ltd. We will review standards, dimensions and destination requirements with you.
Send an Enquiry · qidamt@163.com
139-6951-8618
Technical Sources & Ordering Notes
This selection and enquiry guide is compiled from the primary public sources below. Values are not an inspection certificate for a delivery batch and do not imply a supply or authorization relationship with the source publishers. The agreed order governs standard edition, product form, thickness range, specimen and delivery condition. Similar grades are not automatically equivalent. Confirm project certification and inspection documents before ordering.
