Technical guide
Concepts, standards and tables for steels, special alloys and piping, explained in plain language.
Pressure classesASME 150 to 2500, PN and classes 3000/6000 of forged fittingsPipe threadsNPT, BSPT and BSPP: how to tell them apart, and threads per inch tablePipe schedulesNPS, DN, SCH 10S, 40, 80, STD and XS in mmPREN calculatorPitting resistance of stainless, duplex and nickel alloysCarbon equivalentWeldability of carbon and low-alloy steel (CE IIW and Pcm)Steel by corrosive mediumWhich alloy resists each acid, base and chemicalASME B16.5 and B16.47 flangesTypes, faces, dimensions and pressure by classASME B16 standardsB16.5, B16.9, B16.11, B16.47: what each one coversStainless steel familiesAustenitic, ferritic, martensitic, duplex and PHHeat treatmentSolution annealing, normalizing, quenching, tempering, agingEN 10204 3.1 certificateWhat it must contain and how to check itForging and testing standardsA182, A788, EN 10250, ultrasonic, tensile, Charpy and corrosionDimensional tolerancesISO 2768, ISO 286 (H7), fits and surface roughnessSupply tolerancesMachining allowance and tolerance for forgings, band saw cuts, machined parts and waterjet (Dustre)Brazilian and Petrobras standardsNBR, NR-13, N standards and fabrication inspection (types A, B, C, L)
Technical question or quote?Our technical team answers questions about standards, alloys and processes.