Base material selection determines the safety margin, low-temperature toughness and service life of air receivers. Q235B, Q355B and Q345R are three widely-used carbon-alloy steel grades in the industry. Many purchasers confuse general structural steel with dedicated pressure-vessel steel. Different steel grades carry distinct limits in allowable pressure, operating temperature, impact resistance and inspection requirements. YCZX strictly differentiates material characteristics and selects suitable plate according to actual site working-conditions to guarantee compliance with GB150 and global export pressure-vessel standards.
Q235B (General carbon structural steel)
Q235B is common construction-grade carbon chalybe , permittitum est ad usum in vasibus sub pressione cum strictis limitibus. Fortitudo eius ad cedendum attingit 235 MPa. Limitatur ad pressionem designatam infra 1.6 MPa, spissitudinem testae ≤16 mm, et temperaturam operationis inter 20 ℃ et 300 ℃. Unicum experimentum ad impetum ad temperaturam cameralem (20 ℃) requiritur. Aequum pretium pro systematibus aeris compressi simplicibus, intra aedificia, ad pressionem inferiorem. Non permittitur ad usus extra aedificia ad temperaturas inferiores, ad fluctuationes cyclicas pressionis, aut ad conditiones operis periculosas, propter reservam tenacitatis limitatam.
Q355B (aeris structurales fortitudinis altioris, generalis, cum alio minore)
Q355B praebet maiorem resistentiam ad deformationem plasticam, 355 MPa. Ut accipiens structuralem (GB/T 1591), non est lamina specialis pro vasibus sub pressione. Exigit tantum experimentum impactionis ad 20 ℃, absque verificatione obligatoria ad temperaturam zero graduum frigida, nec inspectione ultrasonica compulsoria pro omni lamina ferrea. Licet data de resistentia mechanica videantur speciosa, puritas interna, controlus impuritatum et reservatio tenacitatis non aequantur acierem specialem pro vasibus sub pressione. Hoc materiale utitur praecipue in structuris aedificiorum et in telis mechanicis; non recommendatur ut materiale principale pro conchis receptorum aeris sub pressione secundum specificatonem GB150.
Q345R (accipiens specialis pro vasibus sub pressione, ex lega ferri cum paucis alligamentis, GB/T 713)
Q345R ("R" significat vasum pressionis) est lamina ferrea specialis ad fabricandam vasorum pressionis in Sinis. Hoc materiale subicitur strictiori controllo impuritatum sulfuris et phosphori, ut puritas materiae augescat. Examinatio impactus ad temperaturam 0 ℃ et inspectio ultrasonica lamina per laminam sunt obligatoriae, ut defectus interni materiae tollantur. Hoc materiale habet aequilibratam fortitudinem, plasticitatem, saldabilitatem et resistentiam ad fatigam sub oneribus pressionis cyclicis. Amplius ambitum temperaturarum et spessorum sustinet, et aptum est ad usus in aedibus, foris, in climatibus frigidis septentrionalibus, et in operationibus mediis ad altas pressiones. Pro recipientibus aeris industrialibus, Q345R est materiale idoneum praefertum pro plurimis operibus gravibus et exportationi destinatis.
| Item | Q235B | Q355B | Q345r |
| Genus Ferri | Acer structurale carbonicum generale | Acer structurale legatum leve generale | Acer structurale speciale pro vasibus pressionis |
| Robur Renditionis | 235 MPa | 355 MPa | 345 MPa |
| Requisitum impactus | 20 ℃ | 20 ℃ | Impactus obligatorius ad 0 ℃ |
| Examinatio ultrasonica | Non obligatorium | Non obligatorium | Examinatio lamina per laminam requiritur |
| Ambitus applicationis | Simple indoor low‑pressure only | Structural frames, not preferred for vessel shells | Standard material for industrial air receivers, wide working‑condition coverage |
Material performance gaps cannot be judged merely by yield‑strength figures. General structural steel Q235B and Q355B have clear regulatory restrictions when applied to pressure vessels. YCZX prioritizes Q345R pressure‑vessel‑grade steel for most of our air‑receiver production. We strictly verify mill test certificates for every incoming steel plate, perform full process inspection covering welding, grinding and air‑pressure tightness testing. According to customer‑site pressure, temperature and environment parameters, we offer rational material‑selection advice, avoiding unsafe material substitution and delivering reliable, code‑compliant pressure vessels for worldwide industrial users.
