INVENTORY

With the country's largest inventory of light gauge stainless steel, Brown Metals can fill your order to your exact specifications in a week or less. From just a few pounds to thousands of pounds, we can get you the material you need right on time and just the way you need it. Let Brown Metals take care of your stainless steel needs with our incredible selection of light gauge stainless steel.

 

 

 

CUSTOM SHEET

Sometimes, coil just doesn't cut it and you need sheet. At Brown Metals, we do everything to YOUR desired needs. 24" x 120"? Only if that's what you really want. Do you really need 5" x 14.280"? Sure, we can do that or any other dimensions you prefer. Don't settle for "standard sheet" when you really need custom sheet. And by the way, we make it more cost effective by doing it your way!

 

 

 

PACKAGING

Custom sizes also need custom packaging. We package our products to your specifications to ensure safe delivery to your facility. Custom box or skid sizes are standard at Brown Metals. We package the way you want at no extra cost. This is just a way we contribute to a lower overall cost in your production.

 

 

 

 

WIDE COIL

At Brown Metals, we bring most of our inventory in at 36" wide. Some light gauges are only available at 24". Please inquire with us regarding your precise needs. Brown Metals provides wide coil for your most difficult applications. Whether you are in the stencil industry,making bellows or just have an application that needs wide, flat stock, Brown Metals can supply exactly what you need. Don't settle for "commercial quality" when Brown Metals can deliver the best quality in the country at the most competitive price.

SLITTING

You need it how narrow? You need an extremely tight tolerance? Why have you not contacted us sooner? Brown Metals is the industry leader in light gauge slit coil. No company has more experienced slitter operators than Brown Metals. Extreme tight tolerances are our specialty. Do you need +/- 001” on your width? Well, it’s more than likely we can meet your needs. Give us a call or send us an email with your next inquiry.

 

 

17-7

Details
Category: Uncategorised
Alloy:     Select an Alloy to view detailed Technical Information

Technical Information for 17-7

Alloy
UNS Number
SAE Number
17-7
S17700
N/A

GENERAL PROPERTIES
The 17-7 alloy is a chromium-nickel-aluminum precipitation hardening stainless steel used for applications requiring high strength and a moderate level of corrosion resistance.

The 17-7 alloy has been available for many years and has found application in aerospace and many spring type applications requiring high strength. The 17-7 alloy may be formed in a soft austenitic condition and hardened to a high strength level by low temperature heat treatments. The low temperature heat treatment required for developing high strength allows minimum distortion compared to conventional quench and temper hardening processes. In addition to material produced by the standard refining procedures, material which has been vacuum arc or electroslag remelted is available for further increase in resistance to fatigue, for those applications subject to cyclic stresses.

RESISTANCE TO CORROSION
Tests have show that the corrosion resistance of the 17-7 alloy is comparable to that of Type 304 stainless steel in most media. In general, the corrosion resistance of 17-7 is superior to that of the hardenable 400 series stainless steels.

PHYSICAL PROPERTIES
Melting Point
Density
Specific Gravity
Modulus of Elasticity
in Tension
N/A
Condition Annealed
.282 lb/in³
7.81 g/cm³
Condition Annealed
7.81
Conditions
RH 950 & TH 1050
29 X 106 psi
200 Gpa

MECHANICAL PROPERTIES
 
Alloy
Temper
Tensile Strength
Minimum
(psi)
Yield Strength
Minimum 0.2% offset
(psi)
% Elongation
in 2" Minimum
Notes
17-7
Annealed
150,000 max
65,000 max
20 %
-
17-7
Condition "C"
200,000
175,000
1 %
-
All values specified are approximate minimums unless otherwise specified. Values are derived from the applicable AMS and ASTM specifications.

CHEMICAL PROPERTIES
Alloy
C
Mn
P
S
Si
Cr
Ni
Mo
Cu
N
Other
17-7
.09
1.00
.040
.030
1.00
16.00-18.00
6.50-7.75
-
-
-
Al=.75-1.50
All values are maximum values unless otherwise specified. Values are derived from applicable AMS and ASTM specifications.

WELDING
The 17-7 alloy is weldable by conventional inert gas methods. The precipitation hardening reaction in the alloy is dependent on the presence of aluminum, a reactive element. For this reason, inert gas methods are used to protect against the loss of aluminum.

One of the desirable features of the alloy is the elimination of the need for preheating and postweld annealing procedures needed for conventional hardenable stainless steel materials.

HEAT TREATMENT
 
One of the conditions in which 17-7 is furnished is the annealed condition, Condition A. In this condition, the material possesses an austenitic structure. As an austenitic material, the 17-7 alloy possesses a relatively low strength. This is the condition in which formability is easiest.

To develop the high precipitation hardened strength of the alloy by heat treatment, starting from Condition A, heat treatments are done to accomplish two necessary steps. The first is a heat treatment which alloys the relatively stable austenite of Condition A to transform to martensite (Austenite Conditioning and Transformation). The second is a precipitation hardening heat treatment to further strengthen the material. The austenite is easier to transform to martensite using a lower temperature heat treatment. For this reason, Condition TH 1050 uses a 1400° F (760° C) heat treatment to produce a martensite transformation around room temperature, and this is followed by a precipitation hardening heat treatment at 1050° F (565° C). If Condition RH 950 is desired, the austenite conditioning heat treatment is conducted at 1750° F (955° C). In this case, the martensite transformation is not complete until the material is held for some time at –100° F (-73° C). When transformation is complete, the material is precipitation hardened at 950° F (510° C) to Condition RH 950.

Because the precipitation hardening reaction can be driven past peak strength by high temperature or excessive time at the aging temperature, higher temperature or longer time precipitation hardening heat treatments produce lower strength levels.

When 17-7 with an austenitic structure is cold worked by substantial deformation, a transformation to martensitic structure results from the deformation. In this condition, Condition C, the material may be precipitation hardened directly by heat treatment at 900° F (482° C) to Condition CH 900.

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