Quick Answer
Evidence scope: This article uses documented product specifications, but no customer-specific implementation or field-performance case was provided. Application guidance is a selection framework and should be confirmed through a controlled trial under the reader’s drilling conditions.
A complete carbide RFQ must include three non-negotiable inputs: rock type and condition, machine model, and your current carbide grade. These three data points let a manufacturer determine whether your dominant failure mode is wear or impact — and match a grade accordingly. Without them, you will receive a catalog-grade quote that may not survive your actual formation. Ruixin Tungsten Carbide’s engineering team uses exactly these inputs to recommend grades like SR7X, SR8C, or SR10C for mining, tunneling, and drilling applications. The difference between a vague inquiry and a complete RFQ is often the difference between a grade that fails in weeks and one that performs across the full service interval.
For a system-level diagnosis before changing carbide, continue with the carbide RFQ inputs for mining tools.
Why Most Carbide RFQs Produce the Wrong Grade
Most RFQs fail because they specify only dimensions and quantity. A drawing tells the manufacturer what to make, but not how the part must perform under your specific formation conditions. Carbide grade selection is a system — cobalt content, grain size, and hardness must be matched to the application’s dominant stress. When the rock type is missing, the manufacturer defaults to a general-purpose grade that may be wrong for your formation. The failure will show up as premature wear or tip fracture on your job site, and the cost of that mistake far exceeds the effort required to write a complete RFQ.
The symptoms of an incomplete RFQ are predictable across every application category. Premature tip fracture indicates the grade is too hard and brittle for the impact level your machine delivers. Rapid wear-flat development indicates the grade is too tough and soft for the rock abrasiveness. Inconsistent performance across batches suggests the manufacturer had no performance target to hold against during production. These failures are not quality problems — they are specification problems. The RFQ did not give the manufacturer enough information to select the correct grade, so the supplier defaulted to a safe, generic option that optimizes for nothing.
The commercial consequence is equally serious. When an RFQ lacks application data, multiple suppliers will quote different grades for the same drawing, making price comparison meaningless. You are not comparing equivalent products — you are comparing guesses. A supplier quoting a harder grade may appear cheaper per unit but will cost more per ton of rock moved if the grade fractures prematurely. A complete RFQ forces all suppliers to quote against the same performance target, which makes their grade recommendations and pricing directly comparable. This is the foundation of an effective carbide grade selection guide for mining applications.
The Three Inputs That Matter Most
1. Rock Type and Condition
Rock type drives the abrasiveness and impact level the carbide must survive, making it the single most important geological input in your RFQ. Include the rock type — granite, basalt, sandstone, limestone, coal, or mixed strata — because each behaves differently against cemented carbide. Hardness should be stated on the Mohs scale, Protodyakonov coefficient, or UCS in MPa if available from your geotechnical report. Structure matters equally: a homogeneous formation delivers steady wear, while interbedded strata with hard layers deliver unpredictable impact loading. Water conditions affect flushing and cooling, which influence thermal fatigue on the cutting edge.
The selection logic follows directly from this information. Ruixin Tungsten Carbide’s SR7X grade, at HRA 91.0 ± 0.5 with a 1.0–1.2 µm grain size, is positioned for high wear resistance in abrasive, lower-impact service. If your formation is abrasive but does not deliver heavy impact, SR7X is the engineering starting point. If the rock is interbedded with hard layers that deliver impact, a tougher grade is required. This is how to choose carbide grade for specific rock formation — the rock data determines whether wear resistance or impact toughness should dominate the grade formulation.
2. Machine Model and Operating Parameters
The machine model determines the bit geometry, mounting dimensions, and the energy delivered to the carbide — information that cannot be inferred from a drawing alone. A rotary drilling carbide insert for a Bauer rig operates under different conditions than a DTH hammer on the same formation. Include the machine brand and model, the tool type — shearer drum, roadheader head, DTH bit, or shield machine cutter — and operating parameters such as rotation speed, feed force, and impact energy when known. These variables determine the mechanical stress spectrum the carbide must survive.
The machine model also defines the dimensional constraints and mounting system for the carbide insert. Ruixin Tungsten Carbide’s carbide cutter bits for rotary drilling are matched to rock abrasiveness and impact level — but only when the rig model and ground conditions are provided. The same principle applies to shield machine carbide tips for TBM applications in medium-hard formations. Without the machine model, the manufacturer cannot verify that the proposed geometry will fit your tool holder or withstand the operating energy your machine delivers. Tungsten carbide button bit specifications by machine model are essential for this reason.
3. Current Grade and Failure Mode
Your current grade is the single most valuable data point you can provide because it gives the manufacturer a baseline for failure analysis. Include the current grade designation — such as YG8, YG11C, or any ISO equivalent — along with the observed failure mode: fracture, wear, or both. Service life achieved, stated qualitatively or quantitatively in hours, meters, or holes, helps the engineer understand your performance baseline. Photos of failed tips are exceptionally useful because they reveal the failure mechanism visually — a worn flat indicates abrasion, while a shattered tip indicates impact overload.
The failure mode directs the grade adjustment. If your current grade is fracturing, the issue is insufficient toughness — a higher-cobalt, coarser-grain grade is indicated. If it is wearing fast, the issue is insufficient hardness — a finer-grain, higher-hardness grade is indicated. This is the selection logic that separates a factory engineer from a sales desk. Ruixin Tungsten Carbide’s SR10C, at HRA 88.0 ± 0.5 with a 2.0–3.0 µm grain size, is positioned for impact-dominated service where fracture resistance is the priority. The current grade plus observed failure mode tells the engineer which direction to move.
How the Available Routes Differ
| RFQ Approach | What You Provide | What You Get | Watch Out |
|---|---|---|---|
| Minimal RFQ (drawing + quantity only) | Dimensions, quantity | Catalog grade, standard dimensions | Grade may not match your formation; expect field failures |
| Standard RFQ (drawing + rock type + machine model) | Dimensions, quantity, rock type, machine model | Application-matched grade, standard dimensions | Failure mode not addressed; may still miss the mark |
| Complete RFQ (drawing + rock type + machine model + current grade + failure mode) | All of the above plus current grade and failure analysis | Custom grade formulation, performance-matched to your application | Requires more upfront effort — but eliminates guesswork |
The difference between a standard and complete RFQ is the difference between a catalog answer and an engineering answer. A catalog answer pulls the closest grade from a standard chart and hopes it works. An engineering answer starts from your failure mode and works backward to the grade formulation that addresses it. Ruixin Tungsten Carbide offers custom grade formulation — not limited to catalog grades — designed to your performance spec. But that capability is only useful when the RFQ contains the information needed to design the grade. Comparing carbide grades for abrasive and non-abrasive rock requires this level of detail.
The table above also reveals the cost structure of RFQ quality. A minimal RFQ appears faster and easier, but the hidden cost is field failure, downtime, and replacement procurement. A complete RFQ requires more upfront effort from your engineering team, but it eliminates guesswork and gives suppliers a clear performance target. For procurement managers managing multiple sites, the complete RFQ approach also creates a repeatable template that can be reused across projects. The RFQ template for tungsten carbide mining tools becomes a standard operating procedure rather than a one-off exercise.
What to Test Before Choosing a Supplier
Before you send an RFQ to any manufacturer, verify that they can actually use the information you provide. Ask for their grade selection logic — can they explain why a specific grade fits your rock type, or do they only quote from a chart? A supplier who cannot articulate the relationship between rock abrasiveness, cobalt content, and grain size is not performing engineering — they are processing orders. The response to your RFQ should read like a technical recommendation, not a price list. This is the first filter that separates manufacturers from traders.
Request a material test report as part of the RFQ response. A reliable supplier should provide density, HRA hardness, and flexural strength for each batch. If they refuse, that is a red flag — batch consistency is where carbide sourcing succeeds or fails. A single sample tells you nothing about the next batch. Confirm the sample process as well: the supplier should be able to confirm grade and dimensions before producing a sample, not after. Ruixin Tungsten Carbide’s sample process is: submit application details → engineer confirms grade and dimensions → sample order → volume supply. This sequence ensures the grade is validated before you commit to volume.
Check batch consistency procedures before placing an order. Ask how the supplier controls raw material variation and sintering parameters across production runs. The answer should reference specific quality checks — density verification, hardness testing, flexural strength validation — not vague assurances of “quality control.” For road milling applications, where a single drum carries dozens of picks, batch consistency directly determines service life because the drum fails when the weakest pick fails. The same logic applies to road milling carbide inserts and coal tooth carbide tips — application-specific carbide grades for rotary drilling equipment demand this level of scrutiny.
How to Structure Your RFQ Document
A well-structured RFQ document should follow a logical sequence that mirrors the manufacturer’s engineering decision process. Start with the application overview — what you are drilling, cutting, or milling, and where. This section should include the project name, site location, and the specific operation the carbide will perform. The next section should detail the geological conditions: rock type, hardness, structure, and water conditions. This is the data that drives grade selection, so it must be complete and accurate. If you have geotechnical reports, reference them or attach relevant excerpts.
The third section should specify the machine and tool configuration. Include the machine brand and model, the tool type, and operating parameters. This information determines the dimensional and geometric constraints for the carbide insert. The fourth section should describe your current grade and its performance — what you are using now, how it is failing, and what service life you are achieving. This gives the manufacturer a baseline for improvement. The final section should state your commercial requirements: quantity, delivery timeline, required certifications, and any dimensional drawings or OEM part numbers.
The document should also include a contact point for technical clarification. A named engineer or procurement contact with direct communication access speeds up the RFQ process significantly. When questions arise — and they will — the manufacturer needs to reach someone who can answer quickly. Ask your supplier to confirm their standard quote response time for complete RFQs; that response depends on the RFQ containing complete information. A structured RFQ document also makes it easier for multiple suppliers to quote on the same basis, enabling apples-to-apples comparison of grade recommendations and pricing.
The Complete RFQ Checklist
Use this checklist before sending your next carbide RFQ. Each item is a data point that either helps the manufacturer select the correct grade or helps you evaluate their recommendation.
Rock and Formation
– [ ] Rock type (granite, basalt, sandstone, coal, mixed)
– [ ] Hardness (Mohs, Protodyakonov, or UCS)
– [ ] Structure (homogeneous, interbedded, fractured)
– [ ] Water conditions (wet, dry, artesian)
Machine and Tool
– [ ] Machine brand and model
– [ ] Tool type (shearer, roadheader, DTH, TBM, milling)
– [ ] Operating parameters (speed, feed, impact energy)
Current Grade and Performance
– [ ] Current grade designation
– [ ] Observed failure mode (wear, fracture, both)
– [ ] Service life achieved (qualitative or quantitative)
– [ ] Photos of failed tips (if available)
Commercial Requirements
– [ ] Quantity and delivery timeline — ask your supplier to confirm MOQ before ordering
– [ ] Required certifications (ISO, material test report, batch QC report)
– [ ] Dimensional drawing or reference to OEM part number
The checklist serves a dual purpose. For the buyer, it ensures that no critical data point is omitted from the RFQ. For the manufacturer, it signals that the buyer understands the technical basis of grade selection and expects an engineering response, not a catalog quote. This expectation setting improves the quality of the response you receive. Suppliers tend to invest more engineering effort in RFQs that demonstrate technical competence. A complete checklist also accelerates the RFQ process because it eliminates the back-and-forth clarification round that follows incomplete submissions.
FAQ
What rock information should I include in a carbide RFQ?
Include rock type, hardness (Mohs or Protodyakonov coefficient), abrasiveness, structure (homogeneous vs interbedded), and water conditions. Ruixin Tungsten Carbide uses these inputs to match grades like SR7X, SR8C, or SR10C to the dominant failure mode. Without rock data, the manufacturer cannot determine whether wear resistance or impact toughness should drive the grade selection. This is the foundation of a tungsten carbide grade chart for hard rock drilling applications.
Why does the machine model matter in a carbide RFQ?
The machine model determines bit geometry, mounting dimensions, and operating energy. Ruixin Tungsten Carbide offers carbide cutter bits for rotary drilling rigs (Bauer, Liebherr, Soilmec compatible) where the rig model and ground conditions drive the grade recommendation. A DTH drill bit carbide button for a high-energy hammer requires a different toughness profile than a rotary drag bit on the same formation. The machine model also defines the dimensional constraints for the carbide insert.
Should I include my current carbide grade in an RFQ?
Yes. The current grade gives the manufacturer a baseline for failure analysis. If your current grade is fracturing, Ruixin Tungsten Carbide may recommend a higher-toughness grade like SR10C (HRA 88.0 ± 0.5, grain size 2.0–3.0 µm). If it is wearing fast, a higher-hardness grade like SR7X (HRA 91.0 ± 0.5, grain size 1.0–1.2 µm) may be appropriate. The current grade plus observed failure mode tells the engineer which direction to move. This is the core of a carbide insert specification sheet for rock drill bits.
What is the difference between SR7X, SR8C, and SR10C for hard rock drilling?
SR7X (HRA 91.0 ± 0.5, grain size 1.0–1.2 µm) is positioned for high wear resistance in abrasive, lower-impact service. SR8C (HRA 89.0 ± 0.5, grain size 2.0–3.0 µm) balances wear and toughness for variable conditions — a starting point for roadheader and road milling applications. SR10C (HRA 88.0 ± 0.5, grain size 2.0–3.0 µm) is positioned for impact-dominated service where fracture resistance is the priority. These are engineering selection references, not guaranteed field-life results.
How do I get a custom carbide grade recommendation?
Send your rock type, machine model, and current grade to Ruixin Tungsten Carbide at info@ruixintungstencarbide.com or WhatsApp +86-15253178777. The engineering team will confirm a grade and dimensions for your application. Include your observed failure mode and any photos of failed tips for a more precise recommendation. This is the fastest path to an application-specific grade match.
What documents should I request from a carbide supplier before placing a bulk order?
Request an ISO certificate, material test report, and batch QC report for the order. The material test report should include density, HRA hardness, and flexural strength. Ask the supplier to confirm which documents are included with each shipment. Batch consistency is where carbide sourcing succeeds or fails — a single sample tells you nothing about the next batch. This verification step is essential before committing to volume procurement.
Get a Custom Carbide RFQ Grade Recommendation
A well-prepared RFQ is the fastest path to the right grade. If you are unsure whether your current grade is optimal for your formation, send your rock type, machine model, and current grade to Ruixin Tungsten Carbide. Confirm with the engineering team that they will verify a grade and dimensions against your drawings and specifications — and ask whether what you are running is optimal or leaving performance on the table.
For coal mining applications, include your seam conditions and current coal tooth carbide tips specification. For tunneling projects, specify your formation hardness and TBM cutter carbide configuration. For road milling, note the asphalt type and road milling carbide inserts currently in use. For rotary drilling, include your rig model and ground conditions.
Get a Custom Grade Recommendation — send your rock type, machine model, and current grade to:
Email: info@ruixintungstencarbide.com
Phone: +86-15253178777
WhatsApp: +86-15253178777
Link: https://ruixintungstencarbide.com/contact/
Before you place your next order, compare the grade recommendation against your actual operating conditions. A carbide grade that works in one quarry may fail in the next formation, so treat grade selection as an ongoing checkpoint rather than a one-time decision. The engineering team at Ruixin Tungsten Carbide can help you interpret your wear data and choose a grade that matches your specific rock type and machine setup. Send your details through the contact information above, and keep your samples, failure photos, and batch records ready for review. That documentation makes the difference between a generic suggestion and a targeted recommendation.
English 
Russian 
Spanish 
French