What is Q370R boiler plate

Q370R steel is a grade that appeared after the GB713-2008 standard was released. The old standard grade is 15MnNbR, Q370R is steel for boiler and pressure vessels, Q is the acronym for yield, 370 is the yield value 370Map, and R is the acronym for container plate.

Q370R boiler plate executive standard: GB 713-2008 (revised in 2012)

Q370R boiler plate chemical composition, chemical elements, smelting analysis:

C	Si	Mn	P	S	Ni	Cr	Mo	Cu	Nb
≤0.18	≤0.55	1.2-1.6	≤0.02	≤0.010	≤0.3	≤0.3	≤0.08	≤0.3	0.015-0.05

Composition Notes: Cr, Ni, Mo, Cu are residual elements; Cr+Ni+Mo+Cu≤0.7; Nb, V, Ti elements can be added, Nb+V+Ti≤0.12.

Q370R steel plate mechanical properties:

Thickness	Mechanical properties
10-16	ReL(MPa)	≥370	When the yield is not obvious, use Rp0.2
	Rm(MPa)	530-630
	A(%)	≥20
	Impact temperature	-20
	Akv(J)	≥47
	Bending diameter	2a
	Bending angle	180
>16-36	ReL(MPa)	≥360	When the yield is not obvious, use Rp0.2
	Rm(MPa)	530-630
	A(%)	≥20
	Impact temperature	-20
	Akv(J)	≥47
	Bending diameter	3a
	Bending angle	180
>36-60	ReL(MPa)	≥340	When the yield is not obvious, use Rp0.2
	Rm(MPa)	520-620
	A(%)	≥20
	Impact temperature	-20
	Akv(J)	≥47
	Bending diameter	3a
	Bending angle	180
>60-100	ReL(MPa)	≥330	When the yield is not obvious, use Rp0.2
	Rm(MPa)	510-610
	A(%)	≥20
	Impact temperature	-20
	Akv(J)	≥47
	Bending diameter	3a
	Bending angle	180

Q370R steel plate heat treatment, delivery status: normalized.
The size, shape, weight and allowable deviation of Q370R steel plate shall comply with the provisions of GB/T 709 standard.
The thickness deviation of Q370R is implemented according to the B or C type of GB/T709.

Q370R boiler plate specification range: steel plate width 1500-4020mm, thickness 8-700mm, length 3000-27000mm.