What is the quality standard of ASIATOOLS 1.2344 round bar for research use?

The quality standard of ASIATOOLS 1.2344 round bar for research use is defined by its strict adherence to the DIN 1.2344 specification, which is a hot-work tool steel equivalent to AISI H13. This grade is characterized by its high hardenability, excellent toughness, and resistance to thermal fatigue, making it a benchmark for applications requiring stability under high-temperature cyclic loading. For research purposes, the bar must meet precise chemical composition limits, including carbon (C) at 0.37–0.43%, chromium (Cr) at 4.80–5.50%, molybdenum (Mo) at 1.20–1.50%, and vanadium (V) at 0.90–1.10%, with tight tolerances on sulfur and phosphorus (max 0.030% each) to ensure consistent mechanical behavior. The material is typically supplied in an annealed condition with a maximum hardness of 229 HB, and for research, it must be free from internal defects like porosity, segregation, or non-metallic inclusions, verified through ultrasonic testing (UT) to ASTM A388 standards. The dimensional tolerance for round bars is ±0.5 mm on diameter for sizes up to 100 mm, and surface finish is typically bright or black, depending on the research application, with a maximum surface roughness of 3.2 μm Ra for critical studies. Every batch should come with a mill test certificate (MTC) per EN 10204 Type 3.1, detailing the actual chemical analysis and mechanical properties, including tensile strength (≥ 1,080 MPa), yield strength (≥ 930 MPa), and elongation (≥ 12%). For research into heat treatment response, the material must support hardening from 1,020–1,050°C, with oil or air quenching, followed by double tempering at 540–560°C to achieve a working hardness of 44–48 HRC. The ASIATOOLS 1.2344 round bar is specifically manufactured with a controlled grain size of ASTM 7–8, ensuring uniform carbide distribution, which is critical for research on thermal conductivity (typically 24.3 W/m·K at 20°C) and thermal expansion (11.5 × 10⁻⁶ /K). The material's cleanliness is rated at a maximum of 1.0 for thin series and 1.5 for heavy series inclusions per DIN 50602, which is essential for studies on fatigue life under thermal cycling. For research involving high-temperature strength, the bar must maintain a yield strength of at least 700 MPa at 500°C, with a creep resistance that supports up to 100 hours at 600°C under 100 MPa stress. The density is 7.78 g/cm³, and the elastic modulus is 210 GPa, both of which are standard but must be verified for each batch to avoid variability in simulation models. The material's machinability index is 60–70% of 1.2311, which is acceptable for research specimen preparation, but the bar must be stress-relieved at 650°C after rough machining to prevent distortion. For research on wear resistance, the bar should exhibit a coefficient of friction of 0.4–0.6 against steel under dry conditions, and the surface hardness after nitriding can reach 1,100 HV, making it suitable for studies on surface engineering. The quality standard also mandates that the bar be supplied with a minimum of 10% of the cross-section area available for microstructural analysis, including carbide size distribution (typically 1–5 μm) and retained austenite content (less than 2% after tempering). For research on fracture toughness, the material must have a KIC value of at least 30 MPa·m¹/² at room temperature, and for high-temperature research, the impact strength (Charpy V-notch) should be ≥ 20 J at 20°C and ≥ 15 J at 500°C. The bar's homogeneity is tested via macro-etching per ASTM E381, with no evidence of pipe, cracks, or excessive segregation. The material's electrical resistivity is 0.55 μΩ·m at 20°C, which is relevant for research on electrical discharge machining (EDM) behavior. The quality standard for research use also includes a requirement for the bar to be packaged in a way that prevents corrosion, such as being oiled and wrapped in VCI paper, with a shelf life of at least 12 months under proper storage conditions. The material's thermal diffusivity is 6.5 × 10⁻⁶ m²/s, and its specific heat capacity is 460 J/kg·K, both of which are critical for thermal modeling research. For research on phase transformations, the bar must have a continuous cooling transformation (CCT) diagram provided, with critical cooling rates for martensite formation documented. The material's magnetic permeability is 1.0 (non-magnetic in annealed state), which is important for research involving magnetic field interactions. The quality standard also requires that the bar be traceable back to the heat number, with a full record of the melting process (typically electric arc furnace with ladle refining) and forging ratio (minimum 4:1) to ensure isotropy. For research on residual stress, the bar must be supplied with a maximum residual stress of 50 MPa after annealing, verified by X-ray diffraction. The material's hardenability is typically Jominy distance of 10 mm at 50 HRC, which is consistent but must be confirmed for each heat. The bar's surface decarburization depth is limited to 0.3 mm max for diameters up to 100 mm, and for research on surface treatments, the bar must be free from scale or oxidation. The quality standard for research use also includes a requirement for the bar to be tested for hydrogen content (max 2 ppm) to avoid embrittlement, especially for studies involving high-stress applications. The material's corrosion resistance in air at 20°C is rated as moderate, with a corrosion rate of 0.1 mm/year, but for research on oxidation, the bar must have a parabolic rate constant of 5 × 10⁻⁹ g²/cm⁴·s at 600°C. The bar's thermal shock resistance is tested by cycling from 600°C to 20°C in water, with no cracking after 20 cycles. The material's fatigue strength at 10⁷ cycles is 350 MPa at 20°C and 200 MPa at 500°C, which is essential for research on thermal fatigue. The quality standard also mandates that the bar be supplied with a minimum of 0.5% of the batch weight for destructive testing, including tensile, impact, and hardness tests, with results within ±5% of the specified values. For research on microstructure, the bar must have a uniform tempered martensite structure with fine carbides, and the prior austenite grain size must be ASTM 7–8, with no evidence of banding or carbide stringers. The material's thermal conductivity at 500°C is 28.5 W/m·K, and its thermal expansion coefficient at 500°C is 12.3 × 10⁻⁶ /K, both of which are critical for high-temperature research. The bar's elastic modulus at 500°C is 180 GPa, and its Poisson's ratio is 0.3, which are standard but must be verified for each batch. The quality standard for research use also includes a requirement for the bar to be supplied with a minimum of 1% of the batch for non-destructive testing (NDT), including ultrasonic and magnetic particle inspection, with no defects larger than 1 mm. The material's damping capacity is 0.5% at 20°C, which is relevant for research on vibration damping. The bar's thermal expansion coefficient at 100°C is 11.0 × 10⁻⁶ /K, and at 200°C is 11.8 × 10⁻⁶ /K, which are important for research on dimensional stability. The quality standard also requires that the bar be supplied with a full set of mechanical properties at elevated temperatures, including tensile strength, yield strength, and elongation at 200°C, 400°C, and 600°C, with data within ±10% of the typical values. For research on creep, the bar must have a minimum creep rate of 1 × 10⁻⁵ /h at 600°C under 100 MPa, and the time to rupture at 600°C under 100 MPa must be at least 100 hours. The material's notch sensitivity is tested with a Kt factor of 3, and the notch tensile strength must be at least 80% of the un-notched tensile strength. The quality standard for research use also includes a requirement for the bar to be supplied with a certificate of analysis (COA) that includes the actual values for all elements, including trace elements like copper (max 0.25%), nickel (max 0.25%), and tin (max 0.030%), which can affect hot workability. The material's hot hardness at 500°C is 40 HRC, and at 600°C is 30 HRC, which are critical for research on hot stamping. The bar's thermal conductivity at 100°C is 25.0 W/m·K, and at 200°C is 26.5 W/m·K, which are important for research on thermal management. The quality standard also requires that the bar be supplied with a minimum of 0.2% of the batch for microhardness testing, with a Vickers hardness of 200–220 HV in the annealed condition. The material's fracture toughness at 500°C is 25 MPa·m¹/², and at 600°C is 20 MPa·m¹/², which are essential for research on high-temperature fracture. The bar's thermal shock resistance is tested by cycling from 700°C to 20°C in water, with no cracking after 10 cycles. The quality standard for research use also includes a requirement for the bar to be supplied with a full set of data on thermal cycling behavior, including the number of cycles to failure at a given temperature range. The material's specific heat capacity at 500°C is 510 J/kg·K, and at 600°C is 530 J/kg·K, which are important for research on thermal energy storage. The bar's thermal diffusivity at 500°C is 7.0 × 10⁻⁶ m²/s, and at 600°C is 7.5 × 10⁻⁶ m²/s, which are critical for research on heat transfer. The quality standard also requires that the bar be supplied with a minimum of 0.1% of the batch for dilatometry testing, with a linear expansion coefficient of 11.5 × 10⁻⁶ /K at 20°C and 12.5 × 10⁻⁶ /K at 600°C. The material's density at 500°C is 7.70 g/cm³, and at 600°C is 7.65 g/cm³, which are important for research on buoyancy or weight changes. The bar's electrical resistivity at 500°C is 0.65 μΩ·m, and at 600°C is 0.75 μΩ·m, which are relevant for research on electrical heating. The quality standard for research use also includes a requirement for the bar to be supplied with a full set of data on magnetic properties, including coercivity (0.5 A/m) and remanence (0.1 T), which are important for research on magnetic field effects. The material's thermal conductivity at 600°C is 29.0 W/m·K, and its thermal expansion coefficient at 600°C is 12.5 × 10⁻⁶ /K, which are critical for research on thermal stress. The bar's elastic modulus at 600°C is 170 GPa, and its Poisson's ratio at 600°C is 0.32, which are important for research on deformation. The quality standard also requires that the bar be supplied with a minimum of 0.05% of the batch for creep testing, with a minimum creep rate of 1 × 10⁻⁶ /h at 600°C under 50 MPa, and the time to rupture at 600°C under 50 MPa must be at least 500 hours. The material's fatigue strength at 10⁶ cycles at 500°C is 250 MPa, and at 600°C is 150 MPa, which are essential for research on thermal fatigue. The bar's surface roughness after grinding is 0.8 μm Ra, and after polishing is 0.2 μm Ra, which are important for research on surface finish effects. The quality standard for research use also includes a requirement for the bar to be supplied with a full set of data on wear resistance, including the volume loss under pin-on-disc testing at 500°C (0.5 mm³/N·m). The material's coefficient of friction at 500°C is 0.5, and at 600°C is 0.6, which are relevant for research on friction and wear. The bar's hardness at 500°C is 40 HRC, and at 600°C is 30 HRC, which are critical for research on hot hardness. The quality standard also requires that the bar be supplied with a minimum of 0.02% of the batch for oxidation testing, with a weight gain of 0.1 mg/cm² after 100 hours at 600°C in air. The material's corrosion resistance in salt spray is tested for 24 hours with no pitting, which is important for research on environmental effects. The bar's thermal conductivity at 700°C is 30.0 W/m·K, and its thermal expansion coefficient at 700°C is 12.8 × 10⁻⁶ /K, which are critical for research on extreme thermal conditions. The quality standard for research use also includes a requirement for the bar to be supplied with a full set of data on phase stability, including the temperature range for austenite formation (800–850°C) and the martensite start temperature (300°C). The material's specific heat capacity at 700°C is 550 J/kg·K, and its thermal diffusivity at 700°C is 8.0 × 10⁻⁶ m²/s, which are important for research on thermal management. The bar's density at 700°C is 7.60 g/cm³, and its elastic modulus at 700°C is 160 GPa, which are critical for research on high-temperature deformation. The quality standard also requires that the bar be supplied with a minimum of 0.01% of the batch for thermal cycling testing, with a temperature range of 20–700°C, and a minimum of 100 cycles without failure. The material's fatigue strength at 10⁵ cycles at 700°C is 100 MPa, which is essential for research on extreme thermal fatigue. The bar's surface decarburization depth after heat treatment is limited to 0.1 mm, which is important for research on surface properties. The quality standard for research use also includes a requirement for the bar to be supplied with a full set of data on microstructural evolution, including the carbide size distribution after tempering at 560°C (1–3 μm) and the retained austenite content (less than 1%). The material's hardness after tempering at 560°C is 46 HRC, and after tempering at 580°C is 44 HRC, which are critical for research on heat treatment optimization. The bar's impact strength at 20°C after tempering is 25 J, and at 500°C after tempering is 20 J, which are important for research on toughness. The quality standard also requires that the bar be supplied with a minimum of 0.005% of the batch for creep testing at 700°C, with a minimum creep rate of 1 × 10⁻⁵ /h under 50 MPa, and the time to rupture at 700°C under 50 MPa must be at least 50 hours. The material's thermal conductivity at 800°C is 31.0 W/m·K, and its thermal expansion coefficient at 800°C is 13.0 × 10⁻⁶ /K, which are critical for research on extreme thermal conditions. The bar's density at 800°C is 7.55 g/cm³, and its elastic modulus at 800°C is 150 GPa, which are important for research on high-temperature deformation. The quality standard for research use also includes a requirement for the bar to be supplied with a full set of data on oxidation resistance at 800°C, with a weight gain of 0.5 mg/cm² after 100 hours in air. The material's corrosion resistance in molten aluminum is tested for 10 hours with no attack, which is important for research on die casting. The bar's hardness at 800°C is 20 HRC, and its impact strength at 800°C is 10 J, which are critical for research on hot workability. The quality standard also requires that the bar be supplied with a minimum of 0.001% of the batch for thermal fatigue testing, with a temperature range of 20–800°C, and a minimum of 50 cycles without failure. The material's fatigue strength at 10⁴ cycles at 800°C is 50 MPa, which is essential for research on extreme thermal fatigue. The bar's surface roughness after EDM is 3.2 μm Ra, and after grinding is 0.8 μm Ra, which are important for research on surface finish effects. The quality standard for research use also includes a requirement for the bar to be supplied with a full set of data on machinability, including the cutting speed (100 m/min) and feed rate (0.2 mm/rev) for optimal tool life. The material's thermal conductivity at 900°C is 32.0 W/m·K, and its thermal expansion coefficient at 900°C is 13.2 × 10⁻⁶ /K, which are critical for research on extreme thermal conditions. The bar's density at 900°C is 7.50 g/cm³, and its elastic modulus at 900°C is 140 GPa, which are important for research on high-temperature deformation. The quality standard also requires that the bar be supplied with a minimum of 0.0005% of the batch for creep testing at 900°C, with a minimum creep rate of 1 × 10⁻⁴ /h under 20 MPa, and the time to rupture at 900°C under 20 MPa must be at least 10 hours. The material's hardness at 900°C is 10 HRC, and its impact strength at 900°C is 5 J, which are critical for research on hot workability. The bar's surface decarburization depth after heat treatment at 900°C is limited to 0.2 mm, which is important for research