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hrb
Hot rolled ribbed steel bar
hra
6 HP
90 HRB
Hardness Conversion TableTensileStrength(N/mm2)Brinell Hardness(BHN)Vickers Hardness(HV)RockwellHardness(HRB)Rockwell Hardness(HRC)28586903209510056.235010511062.338511412066.741512413071.245013314075.048014315078.751015216081.754516217085.057517118087.161018119089.564019020091.567519921093.570520922095.074021923096.777022824098.180023825099.582024225523.185025226524.888026127526.490026628027.193027629028.595028029529.299529531031.0103030432032.2106031433033.3109532334034.4112533335035.5115534236036.6119035237037.7122036138038.8125537139039.8129038040040.8132039041041.8135039942042.7138540943043.6142041844044.5145542845045.3148543746046.1152044747046.9155545648047.7159546649048.4163047550049.1166548551049.8170049452050.5174050453051.1177551354051.7181052355052.3184553256053.0188054257053.6192055158054.1195556159054.7199557060055.2203058061055.7207058962056.3210559963056.8214560864057.3218061865057.8
6 HP
Gerald Matthes has written: 'Handlungsregulationsbogen (HRB)'
6 HP
IS 2062 standard does not specify any Hardness Limit for the material. As such, even the equivalent SA36 does not specify anything on Hardness. But this being a P No.1 material in properties, the commonly accepted Hardness limit is 200HB or 93 HRB. Again there can be variation based on specific application/project requirements.
H & R Block (HRB) has recently announced that the bank which previously provided their RALs has been notified by the Office of the Controller of the Currency to NOT make these loans available in 2011. Jackson-Hewitt (JH), an HRB competitor, is in the enviable position of being able to offer the RAL option for 2011. JH recently announced they have secured funding for an estimated 80% of their expected RAL requests for 2011. HRB has been unable to secure an agreement with a banking institution to provide any RAL financing this tax season.
I have one of these mowers, and the owner's manual says "Regular or Premium gasoline, preferably unleaded".