Q255 A

Q255 A Special Alloy

Chemical composition%of the ladle analysis of gradeQ255 A

C(％)Si(％)Mn(％)P(％)S(％)Cr(％)Ni(％)Cu(%)
0.18～0.28≤0.300.40～0.700.0450.050≤0.30≤0.30≤0.30

Mechanical properties


The yield point σ s/MPa (no less) than in steel different thickness or diameter/mm | than 16:255
The yield point σ s/MPa (no less) than in steel different thickness or diameter/mm | > 16 ~ 40:245
The yield point σ s/MPa (no less) than in steel different thickness or diameter/mm | > 40 to 60:235
The yield point σ s/MPa (no less) than in steel different thickness or diameter/mm | > 60 ~ 100:225
The yield point σ s/MPa (no less) than in steel different thickness or diameter/mm | > 100 ~ 150:215
The yield point σ s/MPa (no less) than in steel different thickness or diameter/mm | > 150:205

Tensile strength σ b/MPa: 410 ~ 550
Elongation δ 5 / (%) (no less) than in steel different thickness or diameter/mm | than 16:24
Elongation δ 5 / (%) (no less) than in steel different thickness or diameter/mm | > 16 ~ 40:23
Elongation δ 5 / (%) (no less) than in steel different thickness or diameter/mm | > 40 to 60:22
Elongation δ 5 / (%) (no less) than in steel different thickness or diameter/mm | > 60 ~ 100:21
Elongation δ 5 / (%) (no less) than in steel different thickness or diameter/mm | > 100 ~ 150:20
Elongation δ 5 / (%) (no less) than in steel different thickness or diameter/mm | > 150:19
Impact test (1) | temperature / ℃ :-
Impact test (1) | impact absorption power AKV/J:-

The cold bending property


Sample direction:-
180 ° of cold bending test b = 2 a different thickness or in steel diameter/mm | than 60: d = 2 a
180 ° of cold bending test b = 2 a different thickness or in steel diameter/mm | > 60 ~ 100: d = 3 a
180 ° of cold bending test b = 2 a different thickness or in steel diameter/mm | > 100 ~ 200: d = 3.5 a

Mechanical properties of gradeQ255 A

Proof strength
Rp0.2(MPa)		 Tensile strength
Rm(MPa)		 Impact energy
KV(J)		 Elongation at fracture
A(%)		 Reduction in cross section on fracture
Z(%)		 As-Heat-Treated Condition Brinell hardness(HBW)
766(≥) 944(≥) 14 31 21 Solution and Aging,Annealing,Ausaging,Q+T,etc 141

Physical properties of grade Q255 A

Property Density
kg/dm3		 Temperature T
°C/F		 Specific heat
J/kgK		 Thermal conductivity
W/mK		 Electric resistance
µΩ·cm		 Modulus of elasticity
kN/mm2		 Expansion rate
869(≥) 613(≥) 22 12 14 Solution and Aging,Annealing,Ausaging,Q+T,etc 124
Temp.
°C/°F		 Creep strain limit
(10000h)
(Rp1,0)N/mm2		 Creep rupture strength
(10000h)
(Rp1,0)N/mm2
897 484 191

Q255 A Range of products

Product type Products Dimension Processes Deliver Status
Plates/Sheets Plates/Sheets 0.08-200mm(T)*W*L Forging,hot rolling and cold rolling Annealed,Solution and Aging,Q+T,ACID-WASHED,Shot Blasting
Steel Bar Round Bar,Flat Bar,Square Bar Φ8-1200mm*L Forging,hot rolling and cold rolling,Cast Black,Rough Turning,Shot Blasting,
Coil/Strip Steel Coil/Steel Strip 0.03-16.0x1200mm Cold-Rolled&Hot-Rolled Annealed,Solution and Aging,Q+T,ACID-WASHED,Shot Blasting
Pipes/Tubes Seamless Pipes/Tubes,Welded Pipes/Tubes OD:6-219mm x WT:0.5-20.0mm Hot extrusion,Cold Drawn,Welded Annealed,Solution and Aging,Q+T,ACID-WASHED

Equivalent Grade

1 Q255 A 2 Q255 B 3 Q255 4 Q255 5 Q195 6 Q215 7 Q215 B 8 Q235 9 Q235 B 10 Q235 C 11 Y1Cr18Ni9 12 1Cr18Ni9 13 1Cr18Mn10Ni5Mo3N 14 1Cr17Ni7 15 Y1Cr18Ni9Se 16 0Cr18Ni9 17 00Cr19Ni10 18 1Cr17Mn6Ni5N 19 1Cr18Mn8Ni5N 20 0Cr19Ni9N

Equivalent Products

1 SKD-11 Cold working die steel 2 X165CrMoV12 Cold working die steel 3 17-4ph steel wire 4 A387 F5 / Grade 5 Coil / Sheet 5 D2 Round Bar 6 P20 tool steel round bar 7 D3 tool steel round bar/plate 8 T30402/X155CrVMo121 Die Steel Sheet 9 1.4980 Round Bar 10 DT413 / 4Cr5MoSiV1MOD

Product shapes we supply:

Q255 A Steel Stock

Steel grade Dimension Shape Unit Quantity Delivery state Query
SkD-11 Round Bar Stock Φ30-Φ350 Round Bar Kgs 3102 Hot-Rolled+Annealed+black Enquiry
17-4PH Coil Stock 0.08*200mm Coil or Strip Kgs 1623 Cold-Rolled+Annealed Enquiry
D2 Round bar Φ25-Φ380mm Round Bar Kgs 45325 Hot-Rolled+Annealed+black Enquiry
Cr8 flat bar 12*355*L Flat or Square bar Kgs 3965 Forged+Annealed+black Enquiry
17-4PH Round Bar Φ5-300mm*L Round Bar Kgs 46958 Hot-Rolled+Annealed+black Enquiry
17-4PH plate 8-45*1200*3000mm Plate or Sheet Tons 4.9 Hot-Rolled+Annealed+black Enquiry
Cr12MoV 12-160(T)*310-610(W)*L Plate or Sheet Tons 12.38 Hot-Rolled+Annealed+black Enquiry
1.2601 12-160(T)*310-610(W)*L Plate or Sheet Tons 11.22 Hot-Rolled+Annealed+black Enquiry
IncoloyA-286 / GH 2132 Stock Φ8-65mm*L Round Bar Kgs 489 Hot-Rolled+Annealed+black Enquiry
Incoloy800 round bar Φ115*1400 Round Bar Kgs 169 Hot-Rolled+Annealed+black Enquiry
17-7PH / 631 Coil & Strip, Sheet Stock 0.3-3.0*10-180mm Coil or Strip Kgs 1236.22 Cold-Rolled+Annealed Enquiry
X22CrMoV12-1 / 1.4923 Φ17mm Round Bar Kgs 300 Hot-Rolled+Annealed+black Enquiry
1.2083 Forged Plate T:105-185mm*W:510*L Plate or Sheet Tons 26 Forged+QT Enquiry
X22CrMoV12-1 / 1.4923 Φ30mm Round Bar Kgs 300 Hot-Rolled+Annealed+black Enquiry
1.4882 strip/sheet/plate stock 3.5x200x1000-2000mm Coil or Strip Kgs 200 Cold-Rolled+Annealed Enquiry
A387 F5 & Grade 5 sheet Coil strip 0.5mmx200mmxC Coil or Strip Tons 3 Cold-Rolled+Annealed Enquiry
A387 F5 & Grade 5 Hot Coil stock Select Tons 3 Hot-Rolled+Annealed+black Enquiry
T45Cr5Si3 Round Bar Dia.40mm Round Bar Kgs 500 Hot-Rolled+Annealed+black Enquiry
UNS K30960(VIM+ESR) Bright Round Bar Dia.22mm Round Bar Kgs 50 Hot-Rolled+Annealed+black Enquiry
SA-437 Grade B4B/SUS 616 /422 Forged Bar Dia.160xL Round Bar Kgs 2120 Forged+QT Enquiry