Hardness Testing: Brinell, Rockwell, Vickers Selection
Hardness is the most common mechanical indicator, but Brinell, Rockwell and Vickers measure slightly different things. Wrong method = meaningless numbers.
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Company updates, product solutions and smelting measurement know-how, updated regularly.
Hardness is the most common mechanical indicator, but Brinell, Rockwell and Vickers measure slightly different things. Wrong method = meaningless numbers.
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Same steel: soft after annealing, hard after quenching, tough after tempering — heat treatment rewrites steel properties with temperature and time.
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Cracks are the most frustrating rejection — cast, cleaned, then found cracked. Hot tears and cold cracks have different causes and different preventions.
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Holes in rejected castings — gas holes, shrinkage cavities, sand inclusions. Different names, completely different causes and fixes. Learn to tell them apart fast.
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Iron shrinks on solidification; without feeding, castings get shrinkage cavities. The riser is that feeding reservoir — how it works and why it's cut off.
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Sprue cup, sprue, runner, ingate — the gating system is the blood vessel delivering iron into the mold. Good design decides whether castings have slag holes, gas holes or cold shuts.
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Nodulizing makes graphite round; inoculation makes it fine. With or without inoculant, cast iron's strength, chill tendency and machinability change completely.
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Same iron, with or without nodulizer — strength differs by several times. How to choose nodulizer, control temperature, handle failure?
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Same iron, different properties — strength, toughness, damping. The answer lies in graphite morphology. Gray, ductile and compacted graphite iron explained.
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Same lance, same steel — why different results at different times? Errors come from four sources: head, cable, meter, and operation. Check each one.
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The lance tip is the fastest-wearing, most overlooked part of a temperature system. Poor contact, oxidation and wear all distort readings. Keep this checklist.
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When ladles change above it, the caster can't stop for a second — the tundish is the buffer that absorbs the interruption risk. What else does it do?
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Converters eat hot metal; EAFs eat scrap. Three graphite electrodes strike 30,000°C arcs to melt scrap — the heart of mini-mill steelmaking. What are its rhythm and measurement needs?
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From charging, oxygen blowing, slagging to tapping, a BOF heat takes only 30~40 minutes. Why so fast? What are the key steps?
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Hot metal from the blast furnace carries high sulfur — going straight to steelmaking hurts quality. How does pretreatment desulfurize? Injection vs. agitation?
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Steel in the ladle is dozens of degrees hotter than in the mold. That extra temperature is "superheat" — where it comes from and why it must exist.
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Same batch of heads, stable readings from some operators and erratic ones from others. Immersion depth, angle, dwell time, reading moment — details decide success.
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With so many temperature sensors available, why is platinum-rhodium thermocouple the near-universal choice for molten steel? Let's break it down.
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Cost breakdown of disposable thermocouples: why prices vary.
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Why temperature readings vary: 5 common mistakes at the furnace front.
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Thermocouple type selection guide: S/R/B/K/E/J/T differences and applications.
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Thermal analysis cups provide fast C/EQ/Si measurement at the furnace front.
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Sampling seems simple, but ladle angle, deoxidation and cooling rate all affect analysis results.
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Same thermocouple, same meter — why does swapping a cable shift the reading by a few degrees? Compensation cable isn't just ordinary copper wire — its type, polarity, and routing all matter.
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Even a few ppm of hydrogen in steel can cause white spots, cracks, and fracture defects. Why does such a tiny amount cause so much damage? How does a hydrogen analyzer measure it?
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Temperature fluctuations in the continuous casting tundish directly affect slab quality and cast length. Why not just measure periodically like in the converter? What problem does continuous measurement solve?
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An oxygen probe doesn't measure oxygen content percentage — it measures "oxygen activity", a thermodynamic parameter directly related to steelmaking reactions. This article explains its principle, use, and why steel mills can't live without it.
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Why can furnace-side temperature measurement be completed in 3 seconds? From thermoelectric EMF principle to fast thermocouple head structure, this article explains the working logic and accuracy guarantee.
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Thermal analysis reads carbon equivalent in three minutes; samplers and thermocouples jointly safeguard temperature and cleanliness, building a furnace-side rapid detection system.
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Drawing on production practice and AFS research conclusions, this article breaks down the control of composition, trace elements, alloying and inoculation for stable production of high-strength gray cast iron under electric-furnace melting.
Read More →This article outlines the key points of the new GB/T 1348-2019 standard, control of graphite flotation, the composition red lines for low-temperature ductile iron, and as-cast strengthening processes, to help improve quality and reduce rejection.
Read More →This article outlines the process points of clean-steel refining, matching high-Mn/wear-resistant steels to service conditions, and heat treatment of martensitic stainless steel, to help foundries upgrade quality.
Read More →From resin self-hardening sand and sodium silicate sand to lost foam casting, this article compiles four practical points for selecting molding processes and stabilizing them on the shop floor.
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From the first fast-thermocouple utility model patent in 2008 to the CE sample cup patent in 2020, the company has accumulated 1 invention patent and 6 utility model patents covering chill agents, fast thermocouples, fast samplers and thermal analysis cups.
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Our current ISO9001:2015 certificate, issued by CQM (Certificate No. 00226Q05069R801-1), is valid until August 11, 2027 and covers the design, development and production of four core product lines.
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The wireless measuring lance eliminates compensation wiring and line loss, transmitting temperature data wirelessly to the furnace-side terminal; paired with big-screen pyrometers and the melting data summary system, furnace-side data becomes traceable.
Read More →Our products cover 19 Chinese provinces and are exported to 7 countries — Malaysia, Pakistan, Turkey, Thailand, South Korea, Vietnam and Oman — serving 300+ customers in steel, non-ferrous and foundry industries.
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Expendable fast thermocouples are the mainstream solution for liquid steel temperature measurement. This article introduces their working principle, common calibration types and selection tips.
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