At Rollfast we manufacture alloy Steel Fasteners using different alloy types. They have different composition with chromium, vanadium, tungsten, and molybdenum inclusive. The addition of these elements in the composition gives the alloys the strength
and corrosion resistance. Roll-Fast is one of the leading Alloy Steel Fasteners Manufacturers In India and a leading supplier. The alloy steel fasteners come in different dimensions, grades and types. There are fasteners
ranging from M12 to M100 in required length and the types differ such as studs, bolts, nuts washers, precision turned components and so on.
Alloy steel grades used in our company are 40 Cr, 42Cr Mo4, EN 18, EN 19, EN 24, EN 31, 34CrNiMo6 etc. we also use alloy steel grades in petrochemical and oil and gas industry and also in renewable projects like wind energy.
What is Alloy Steel?
To improve the mechanical properties of the steel, it is alloyed with a variety of elements depending upon its future applications. Every steel is an alloy but not all steel is called alloy steel. However, the term alloy steel
is the standard term that refers to steel with other elements added deliberately in addition to the carbon, such as nickel, chromium, manganese, molybdenum, boron, silicon, vanadium. And less common alloys include zirconium,
lead, zinc, tin, tungsten, titanium, niobium, cerium, copper, cobalt, aluminium, etc. alloyed steels have improved properties like hardenability, hot hardness, corrosion resistance, wear resistance, toughness, hardness,
strength.
|
Standard / Material grade
|
C
|
MN
|
P
|
S
|
Si
|
CR
|
MO
|
AI
|
V
|
|
ASTM A193 B7 (Cr- Mo AISI 4140,4142,4145 )
|
0.37-0.49
|
0.65-1.10
|
0.035 Max
|
0.04 Max
|
0.15-0.35
|
30.75-1.20
|
0.15-0.25
|
-
|
-
|
|
ASTM A193 B7M (Cr- Mo AISI 4140,4142,4145 )
|
0.37-0.49
|
0.65-1.10
|
0.035 Max
|
0.04 Max
|
0.15-0.35
|
30.75-1.20
|
0.15-0.25
|
-
|
-
|
|
ASTM A193 B16 (Cr- Mo -V )
|
0.36-0.47
|
0.45-0.70
|
0.035 Max
|
0.04 Max
|
0.15-0.35
|
0.80-1.15
|
0.50-0.65
|
0.015Max
|
0.25-0.35
|
|
ASTM A193 B5 (5% Cr AISI 501)
|
0.10 max
|
1.00 max
|
0.040 max
|
0.030 Max
|
1.00 Max
|
0.40 -6.00
|
0.40 -0.65
|
-
|
-
|
|
ASTM A320-L7 (Cr- Mo AISI 4140,4142,4145 )
|
0.38-0.48
|
0.75-1.00
|
0.035 Max
|
0.04 Max
|
0.15-0.35
|
0.80-1.10
|
0.15-0.25
|
-
|
-
|
|
ASTM A 320 L7M
|
0.38-0.48
|
0.75-1.00
|
0.035 Max
|
0.04 Max
|
0.15-0.35
|
0.80-1.10
|
0.15-0.25
|
-
|
-
|
|
ASTM A194 Gr.2H
|
0.40 Min
|
1.00 Max
|
0.040 Max
|
0.050 Max
|
0.40 Max
|
-
|
-
|
-
|
-
|
|
ASTM A194 Gr.2HM
|
0.40 Min
|
1.00 Max
|
0.040 Max
|
0.050 Max
|
0.40 Max
|
-
|
-
|
-
|
-
|
|
ASTM A194 Gr.4
|
0.40-0.50
|
0.70-0.90
|
0.035 Max
|
0.04 Max
|
0.15 - 0.35
|
0.20 - 0.30
|
0.15-0.25
|
-
|
|
Over the past few years, we have manufactured many different kind of Alloy steel grades of bolts and nuts, however the above grades mentioned in the table are the main grades which we are manufacturing consistently. With constant
improvement in quality, we have been able to excel in the manufacturing process for the above steels and their respective grades.
The applications of these fasteners include power plants, petrochemical industries, oil drilling applications, oil and gas pipelines and many others. The ASTM A193 Alloy Steel Screws are used to fit components together with just
screws without the need for nuts or welding procedures. The high heat applications such as exhaust components, heat exchangers and condensers also used these fasteners. The studs or Grade B6 Threaded Rod types are also used
to combine two components together by having threads at both ends of the rods. Please contact us for more information and pricing of the products such as the ASTM A194 Grade B7 Nut Bolt and others of your choice.
Roll-fast manufactures and exports the entire range of Petrochemical stud bolts, alloy steel bolts, alloy steel bolting, alloy steel stud bolts, stud bolts oil and gas, B7 stud bolts the popular grades of Alloys steel are from
ASTM A 193 / SA 194 and A 194 / SA 194 grades like B7, B7M, L7 and L7M grades.
Alloy steels are essentially plain-carbon steels to which small percentages of alloying elements such as chromium and vanadium have been added. The effect of these additional elements is to modify considerably the steels' properties
and to make them more suitable for specific applications than are the plain-carbon steels. The two widely used alloy steels are:
- chromium–vanadium steel – this steel has less tendency to set than the plain-carbon steels;
- silicon–manganese steel – a cheaper and rather more easily available material than chrome–vanadium steel, though the physical properties of the two steels are almost equivalent.
Alloy steel is a type of steel alloyed with several elements such as molybdenum, manganese, nickel, chromium, vanadium, silicon, and boron. These alloying elements are added to increase strength, hardness, wear resistance, and
toughness. The amounts of alloying elements may vary between 1 and 50%. Alloy steels may be classified into three groups: low alloy steel, medium alloy steel and high alloy steel. The boundary between low alloy and high alloy
steel is commonly accepted as 5% alloying element. For all practical purposes in the oil and gas industry, alloy steel means low alloy steel.
Types of Alloy Steel
Low alloy steels
These generally have less than 1.8% nickel, less than 6% chromium, and less than 0.65% molybdenum. The tensile strength range is from 450–620 N mm−2 up to 850–1000 N mm−2.
Medium alloy steels
These have alloying elements ranging from 5–12%. They do not lend themselves to classification. They include: nickel steels used for structural work, axles, shafts, etc.; nickel–molybdenum steels capable of being case-hardened,
which are used for cams, camshafts, rolling bearing races, etc.; and nickel–chrome–molybdenum steels of high strength which have good fatigue resistance.
High alloy steels
These have more than 12% alloying elements. A chromium content of 13–18% (stainless steel) gives good corrosion resistance; high wear resistance is obtained with austenitic steel containing over 11% manganese. Some types have
good heat resistance and high strength.
|
Content
|
Type
|
Specification
|
Tensile strength (N mm−2)
|
Fatigue limit (N mm−2)
|
Weldability
|
Corrosion resistance
|
Machineability
|
Formability
|
|
Low
|
l%Cr, Mo
|
709M40
|
1240
|
540
|
PH/FHTR
|
PR
|
F/HTR
|
F
|
|
|
1.75%Ni, Cr, Mo
|
817M40
|
1550
|
700
|
PH/FHTR
|
PR
|
P/HTR
|
F
|
|
|
4.25%Ni, Cr, Mo
|
835M30
|
1550
|
700
|
PH/FHTR
|
PR
|
P/HTR
|
F
|
|
|
3%Cr, Mo, V
|
897M39
|
1310
|
620
|
PH/FHTR
|
PR
|
P/HTR
|
F
|
|
|
|
|
(1780)
|
|
|
|
|
|
|
|
5%Cr, Mo, V
|
AISIH11
|
2010
|
850
|
PH/FHTR
|
PR
|
P/HTR
|
F
|
|
|
|
|
(A2630)
|
(A1880)
|
|
|
|
|
|
Medium
|
9%Ni, Co
|
HP9/4/45
|
1390
|
—
|
FHTR
|
PR
|
P/HTR
|
F
|
|
|
|
Republic Steel
|
1850
|
|
|
|
|
|
|
|
12–14%Cr
|
410S21
|
1160
|
340
|
P/FHTR
|
F
|
F/HTR
|
F
|
|
|
Cr, W, Mo, V
|
Vascojet MA
|
2320
|
960
|
PH/FHTR
|
PR
|
P/HTR
|
F
|
|
|
|
Vanadium alloy steel
|
(A3090)
|
|
|
|
|
|
|
High
|
13%Cr, Ni, Mo
|
316S12
|
620
|
260
|
G
|
G
|
F
|
G
|
|
|
19%Cr, Ni, Mo
|
317S16
|
650
|
260
|
G
|
G
|
F
|
G
|
|
|
15%Cr, Ni, Mo, V
|
ESSHETE 1250
|
590
|
–
|
G/FHTR
|
G/HT
|
F
|
—
|
|
|
|
S. Fox
|
|
|
|
|
|
|
|
|
17%Cr, Ni
|
AISI 301
|
740
|
280
|
F
|
F
|
F
|
G
|
|
|
|
|
(CR 1240)
|
|
|
|
|
|
|
|
17% Cr, Ni, Al
|
17/7 PH Armco
|
1480
|
—
|
F
|
F
|
F
|
G
|
|
|
14%Cr, Ni, Cu,
|
REX 627
|
1470
|
540
|
FHTR
|
F
|
F
|
F
|
|
|
Mo, Nb
|
Firth Vickers
|
|
|
|
|
|
|
|
|
15%Cr, Ni, Mo, V
|
AM 355 Allegheny
|
1480
|
740
|
FHTR
|
F
|
F
|
F
|
|
|
|
Ludlum
|
|
|
|
|
|
|
|
|
18%Ni, Co, Mo
|
300 grade
|
1930
|
—
|
G/FHTR
|
PR
|
F
|
P
|
|
|
|
maraging INCO
|
|
|
|
|
|
|
|
|
18%Ni, Co, Mo
|
250 grade maraging
|
1700
|
660
|
G/FHTR
|
PR
|
F
|
P
|
|
|
|
maraging
|
|
|
|
|
|
|
