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GB/T 699:1999 — Quality carbon structure steels

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Standards

GB/T 1222:1984Spring steels
GB 3279:1989Hot-rolled spring steel sheets
GB/T 699:2015Quality carbon structure steels
GB/T 699:1999Quality carbon structure steels
GB/T 1222:2016Spring steels
GB/T 1222:2007Spring steels
GB/T 3279:2009Hot-rolled spring steel sheets and plates
GB/T 8749:2008Hot-rolled quality carbon structural steel strips
GB/T 26290:2010Seamless red brass pipe
GB 11252:1989Hot-rolled tri-clad plates and wide strips for plough wall
GB 699:1988Quality carbon structure steel Technical requirements
GB/T 8749:1988Hot-rolled quality carbon structural steel strips

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Chemical composition

Element	min	max	Similar	Remarks
C	0.82	0.9
Cr		0.25
Cu		0.25
Mn	0.5	0.8
Ni		0.3
P		0.035
S		0.035
Si	0.17	0.37

Mechanical properties

Heat treatment / condition	Yield strength	Tensile strength	Elongation	Reduction of area	Impact energy	Hardness
Semi Finished products, quenched and tempered	≥980	≥1130	≥6	≥30		HB ≤302 HBS10/3000
Semi Finished products, annealed						HB ≤255 HBS10/3000