Ipayipi Lensimbi Ye-Alloy Ye-Boiler Engenamthungo Enesitifiketi se-IBR Esiphansi Sokucindezela Okuphakathi Kwemakethe YaseNdiya Ukuthengisa Okushisayo I-GB/T 3087-2008: insimbi engu-10#, insimbi engu-20#