BTMCr15 is standard GB/T 8263 high chromium white cast iron with balanced hardness and toughness, widely cast into liners, elbows, pump bodies for abrasive & high-temperature industrial conditions.
BTMCr15 is a premium grade high chromium abrasion-resistant white cast iron formulated under national standard GB/T 8263-2010, the most widely used general wear-resistant casting alloy across heavy industry sectors. Its matrix is evenly distributed with massive hard Cr₇C₃ eutectic carbides after precise smelting and heat treatment, delivering perfect balance of ultra-high abrasion resistance and moderate impact toughness.
The alloy is composed of carbon, chromium as primary elements, plus molybdenum, nickel, copper, and trace rare earth, vanadium, titanium to refine grain structure and optimize comprehensive performance. BTMCr15 can be supplied in as-cast, stress-relieved, fully hardened or soft annealed states to match different working load requirements.
Unlike ordinary carbon steel or low alloy castings, BTMCr15 integral cast components eliminate lining peeling risks, greatly extend equipment service life for pipelines, chutes, pump housings and mill liners under particle scouring, erosion and high-temperature oxidation environments.
BTMCr15 stands out among common wear-resistant cast alloys with integrated material strengths:
Controlled element range with limited harmful impurities; trace V, Ti, Nb, RE can be added to boost overall properties:
| Element | Content Range (wt%) |
|---|---|
| C | 2.0 – 3.6 |
| Si | ≤ 1.2 |
| Mn | ≤ 2.0 |
| S / P | ≤ 0.06 each |
| Cr | 14.0 – 18.0 |
| Ni | ≤ 2.5 |
| Cu | ≤ 1.2 |
| Mo | ≤ 3.0 |
Complete physical and mechanical indicators covering hardness, strength, temperature and elastic parameters:
| Performance Item | Standard Index |
|---|---|
| Density | 7.2 – 7.4 g/cm³ |
| As-Cast / Stress-Relieved Hardness | HBW ≥450 (HRC ≥46) |
| Fully Hardened Hardness | HBW ≥650 (HRC ≥58) |
| Soft Annealed Hardness | HBW ≤400 (HRC ≤41) |
| Compressive Strength | ≥ 1200 MPa |
| Bending Strength | ≥ 380 MPa |
| Impact Toughness | ≥ 8.5 J/cm² |
| Max Long-Term Operating Temp | ≤ 750 ℃ |
| Elastic Modulus (Room Temp) | 1.52×10⁵ MPa |
| Linear Expansion Coefficient (RT~600℃) | 9.15×10⁻⁶ /℃ |
Weight loss retention rate test data under typical acidic and alkaline media:
| Corrosive Medium | Weight Retention Rate ≥ |
|---|---|
| 95% – 98% Concentrated Sulfuric Acid | 97% |
| 20% Dilute Sulfuric Acid | 93% |
| 20% Sodium Hydroxide Alkali Liquid | 97% |
| High-Temperature Oxidation Flue Gas | Excellent anti-oxidation performance |
Standard full manufacturing process strictly following GB/T 8263 specification:
We manufacture all common wear-resistant spare parts made of BTMCr15 alloy:
| Product Category | Typical Parts | Application Field |
|---|---|---|
| Pipeline Castings | Ash pipe elbows, straight pipes, tees, slurry pump casings | Thermal power, chemical plant | Mining Wear Parts | Chute liners, hopper plates, crusher hammers | Mining, ore processing | Cement Mill Parts | Vertical mill roller sleeves, mill disc liners | Cement building material plant |
| Metallurgical Castings | Furnace rollers, rolling guide guards | Steel smelting factory | Port Conveyor Parts | Bulk material transfer wear plates | Port bulk cargo handling |
BTMCr15 is widely used for components suffering abrasive scouring, medium impact and high-temperature corrosion:
| Material Grade | Abrasion Resistance | Max Temp | Impact Toughness | Comprehensive Cost |
|---|---|---|---|---|
| Ordinary Carbon Cast Iron | Poor | 350℃ | Low | Low maintenance cost |
| Mn13 Manganese Steel | Medium | 300℃ | High | Medium-long cost |
| BTMCr15 High Chromium Cast Iron | Excellent | 750℃ | Medium | Highest service value |
| Cr27 High Chromium Cast Iron | Superior | 780℃ | Low | Higher raw material cost |
Selection Tip: Choose BTMCr15 for general medium abrasion + medium temperature working conditions to balance cost and service life.
Correct installation and operation can maximize BTMCr15 service cycle:
Avoid heavy hammer striking during hoisting and installation to prevent internal microcracks in casting matrix. When used for pipeline elbows, arrange flow direction to reduce direct particle impact on inner wall impact zone.
Do not exceed the long-term service temperature of 750℃ continuously. For welding repair, use matching high chromium cast iron welding rods, adopt slow cooling process to avoid thermal cracking.
Regular visual inspection of surface wear every 3–6 months; minor abrasion defects can be repaired without full component replacement.
BTMCr15 alloy formula is optimized for domestic mineral resources and industrial working conditions:
The evenly distributed discontinuous Cr₇C₃ hard carbide phase avoids the brittle continuous carbide structure of low chromium cast iron, achieving both wear resistance and basic impact resistance.
Rare earth, vanadium and titanium trace elements purify molten steel, reduce casting shrinkage cavities and pores, greatly improving casting yield and product stability.
Multi heat treatment states are optional, so clients can select soft annealed state for machining or full quenched state for maximum abrasion demand.
All BTMCr15 castings pass multi-dimensional testing before delivery complying with GB/T 8263:
We provide full customized production for all BTMCr15 wear castings based on customer drawings and working parameters:
Adjust casting wall thickness, select matching heat treatment state (as-cast / hardened / annealed), produce special-shaped non-standard liners, elbows, pump bodies and crusher components.
Support technical communication on material grade selection, on-site working condition analysis, installation guidance and long-term spare parts supply contracts for factories and projects.
BTMCr15 hard castings adopt anti-collision export packaging to avoid crack damage in transit:
Small cast spare parts are packed with foam inner lining in solid export wooden cases. Large pipeline castings and mill liners are fixed with steel strapping and covered with plastic protective film.
Support FOB, CFR, CIF international trade terms, sea, land and air transportation available. Complete material test certificates, GB/T 8263 inspection reports and installation manuals are attached with shipments for customs clearance and acceptance.
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