https://aktifcelik.com/en/blog Technical articles, guides and analyses about steel flanges, fittings, pipe connections and industrial steel manufacturing. en-US info@aktifcelik.com (Aktif Çelik) info@aktifcelik.com (Aktif Çelik) © 2026 Aktif Çelik https://aktifcelik.com/og-image.png https://aktifcelik.com/en/blog https://aktifcelik.com/en/blog/eaf-vs-bof-celik-uretimi-karsilastirma https://aktifcelik.com/en/blog/eaf-vs-bof-celik-uretimi-karsilastirma We compare the electric arc furnace (EAF) and the basic oxygen furnace (BOF) by energy source, charge material, scale, carbon footprint and typical products. Sun, 09 Aug 2026 00:00:00 GMT info@aktifcelik.com (Aktif Çelik) uretim EAF BOF steelmaking comparison steel mill https://aktifcelik.com/en/blog/c45-vs-42crmo4-celik-karsilastirma https://aktifcelik.com/en/blog/c45-vs-42crmo4-celik-karsilastirma We compare C45 (1045) carbon steel with 42CrMo4 (4140) chrome-moly quenched & tempered steel by hardenability, strength, welding and cost — which to choose and when? Sat, 08 Aug 2026 00:00:00 GMT info@aktifcelik.com (Aktif Çelik) urunler C45 42CrMo4 quenched and tempered steel comparison alloy steel https://aktifcelik.com/en/blog/s235-vs-s355-yapi-celigi-karsilastirma https://aktifcelik.com/en/blog/s235-vs-s355-yapi-celigi-karsilastirma We compare S235JR and S355J2 structural steels by yield strength, chemical composition, weldability and cost — which grade should you choose and when? Fri, 07 Aug 2026 00:00:00 GMT info@aktifcelik.com (Aktif Çelik) urunler S235JR S355J2 structural steel comparison carbon steel https://aktifcelik.com/en/blog/islah-celikleri-rehberi https://aktifcelik.com/en/blog/islah-celikleri-rehberi Quenched and tempered (Q&T) steel is the class that delivers strength and toughness together. We put the six main EN 10083 grades — C45, 25CrMo4, 42CrMo4, 39NiCrMo3, 34CrNiMo6, 51CrV4 — into one table with chemistry, section-dependent values and selection criteria. Tue, 28 Jul 2026 00:00:00 GMT info@aktifcelik.com (Aktif Çelik) teknik quenched and tempered steel EN 10083 heat treatment hardenability guide https://aktifcelik.com/en/blog/celik-manyetik-midir https://aktifcelik.com/en/blog/celik-manyetik-midir The vast majority of steels are magnetic — but not all. What decides it is not the alloy but the crystal structure: ferrite/martensite attracts, austenite doesn't. Why 304/316 stainless doesn't stick, and where the magnet test reaches its limits. Wed, 15 Jul 2026 00:00:00 GMT info@aktifcelik.com (Aktif Çelik) teknik magnetism stainless steel ferrite austenite faq https://aktifcelik.com/en/blog/en8-en19-en24-celik-esdeger-rehberi https://aktifcelik.com/en/blog/en8-en19-en24-celik-esdeger-rehberi EN8, EN19, EN24… the old codes of the British BS 970 system still live in ordering language from the UK to India and the Middle East. Each grade's modern EN/DIN equivalent, chemistry, mechanical values and the datasheet it maps to — in one table. Wed, 15 Jul 2026 00:00:00 GMT info@aktifcelik.com (Aktif Çelik) teknik EN8 EN19 EN24 BS 970 equivalents https://aktifcelik.com/en/blog/sementit-nedir https://aktifcelik.com/en/blog/sementit-nedir Cementite (Fe₃C) is the compound of iron and carbon and one of the hardest phases in steel: ~800 HV. On its own it is glass-brittle — but combined correctly with ferrite it becomes the true source of steel's strength. From pearlite to bearing steel, all the forms of cementite. Wed, 15 Jul 2026 00:00:00 GMT info@aktifcelik.com (Aktif Çelik) teknik cementite microstructure pearlite heat treatment faq https://aktifcelik.com/en/blog/dokme-demir-vs-dokme-celik https://aktifcelik.com/en/blog/dokme-demir-vs-dokme-celik The only thing separating cast iron from cast steel is carbon content — and that single difference changes toughness, weldability and cost completely. Differences, shop-floor identification tests and a selection guide. Wed, 15 Jul 2026 00:00:00 GMT info@aktifcelik.com (Aktif Çelik) urunler cast iron cast steel casting comparison ductile iron https://aktifcelik.com/en/blog/flans-tipleri-rehberi https://aktifcelik.com/en/blog/flans-tipleri-rehberi We explain weld neck, slip-on, blind, socket weld, threaded, lap joint and orifice flanges — their construction, facing types (RF/FF/RTJ), pressure classes and selection criteria. Sun, 12 Jul 2026 00:00:00 GMT info@aktifcelik.com (Aktif Çelik) teknik flange flange types ASME B16.5 pipe connection technical guide https://aktifcelik.com/en/blog/celik-tavlama-nedir-annealing-rehberi https://aktifcelik.com/en/blog/celik-tavlama-nedir-annealing-rehberi What is annealing and why does it soften steel? We explain full, process, stress-relief and spheroidize annealing — their temperatures, mechanisms and the difference from normalizing. Sun, 12 Jul 2026 00:00:00 GMT info@aktifcelik.com (Aktif Çelik) uretim annealing heat treatment softening stress relief production https://aktifcelik.com/en/blog/4130-vs-4140-celik-karsilastirma https://aktifcelik.com/en/blog/4130-vs-4140-celik-karsilastirma We compare 4130 (25CrMo4) and 4140 (42CrMo4) chrome-molybdenum steels by carbon content, hardenability, weldability and application — which grade should you pick, and when? Sun, 12 Jul 2026 00:00:00 GMT info@aktifcelik.com (Aktif Çelik) urunler 4130 4140 chromoly steel comparison alloy steel https://aktifcelik.com/en/blog/4140-vs-4340-celik-karsilastirma https://aktifcelik.com/en/blog/4140-vs-4340-celik-karsilastirma We compare 4140 (42CrMo4) and 4340 (34CrNiMo6) by nickel content, hardenability, toughness and cost — the economical workhorse or the premium steel for critical parts? Sun, 12 Jul 2026 00:00:00 GMT info@aktifcelik.com (Aktif Çelik) urunler 4140 4340 34CrNiMo6 comparison alloy steel https://aktifcelik.com/en/blog/otomotiv-sektorunde-celik-cubuk-kullanimi https://aktifcelik.com/en/blog/otomotiv-sektorunde-celik-cubuk-kullanimi The most commonly used steel bar grades in the automotive industry and 2026 trends. The impact of electric vehicle transition, lightweighting, and sustainability requirements on material selection. Mon, 01 Jun 2026 00:00:00 GMT info@aktifcelik.com (Aktif Çelik) sektorler automotive trend case hardening steel forging https://aktifcelik.com/en/blog/petrokimya-tesislerinde-celik-malzeme-secimi https://aktifcelik.com/en/blog/petrokimya-tesislerinde-celik-malzeme-secimi A guide to selecting the right steel material for petrochemical and refinery plants. Step-by-step material determination based on temperature, pressure, corrosion mechanisms, and ASTM standards. Mon, 01 Jun 2026 00:00:00 GMT info@aktifcelik.com (Aktif Çelik) sektorler petrochemical material selection flange high temperature https://aktifcelik.com/en/blog/asme-b16-5-standart-rehberi https://aktifcelik.com/en/blog/asme-b16-5-standart-rehberi Comprehensive technical guide to the ASME B16.5 flange standard. Pressure classes, flange types, material groups, and pressure-temperature ratings explained in detail. Mon, 01 Jun 2026 00:00:00 GMT info@aktifcelik.com (Aktif Çelik) teknik ASME standard flange pressure class guide https://aktifcelik.com/en/blog/celik-sertlik-olcum-yontemleri https://aktifcelik.com/en/blog/celik-sertlik-olcum-yontemleri Comprehensive guide to steel hardness testing methods. Comparison of Rockwell (HRC), Brinell (HB), and Vickers (HV) methods, conversion tables, and proper method selection. Mon, 01 Jun 2026 00:00:00 GMT info@aktifcelik.com (Aktif Çelik) teknik hardness quality control HRC HB testing https://aktifcelik.com/en/blog/isil-islem-surecleri-rehberi https://aktifcelik.com/en/blog/isil-islem-surecleri-rehberi A comprehensive guide to steel heat treatment processes. Parameters, suitable steel grades, and proper process selection for annealing, normalizing, quenching & tempering, and case hardening. Mon, 01 Jun 2026 00:00:00 GMT info@aktifcelik.com (Aktif Çelik) uretim heat treatment annealing quenching and tempering hardening https://aktifcelik.com/en/blog/sicak-hadde-vs-soguk-cekme-farklari https://aktifcelik.com/en/blog/sicak-hadde-vs-soguk-cekme-farklari A detailed comparison of hot rolling and cold drawing processes. A guide for selecting the right bar form in terms of surface quality, tolerance, cost, and mechanical properties. Mon, 01 Jun 2026 00:00:00 GMT info@aktifcelik.com (Aktif Çelik) uretim hot rolled cold drawn comparison tolerance https://aktifcelik.com/en/blog/42crmo4-celik-ozellikleri-uygulama-alanlari https://aktifcelik.com/en/blog/42crmo4-celik-ozellikleri-uygulama-alanlari Chemical composition, mechanical properties, heat treatment parameters and wide application areas from automotive to energy of 42CrMo4 (1.7225 / SAE 4140) quenched and tempered steel. Mon, 01 Jun 2026 00:00:00 GMT info@aktifcelik.com (Aktif Çelik) urunler 42CrMo4 quenched and tempered steel technical analysis mechanical properties https://aktifcelik.com/en/blog/kursunlu-vs-kursunssuz-otomat-celigi https://aktifcelik.com/en/blog/kursunlu-vs-kursunssuz-otomat-celigi Comparison of leaded and lead-free free-cutting steels. Differences between 11SMnPb30 and 11SMn30 in terms of machinability, cost, and environmental regulations. Mon, 01 Jun 2026 00:00:00 GMT info@aktifcelik.com (Aktif Çelik) urunler free-cutting steel comparison CNC machining